Answer:
A Both physical and chemical changes.
Explanation:
What factors do Presidents consider when choosing a Supreme Court Justice?
Answer:
Presidents use the same criteria: legal expertise, party affiliation, philosophy, an da sense of the acceptability to the Senate. Define majority opinion, concurring opinion, and dissenting opinion.
Explanation:
what should be angle between force and displacement to get the maximum work
Answer:
0°
Explanation:
The angle between force and displacement should be 0° in order to get the maximum work done.
Work done = Force x dcosФ°
Ф is the angle between force and displacement
When Ф is zero, the maximum work done is attained
When Ф is 90, the minimum work is done, in fact, work done is 0
Which event in a solar cell uses the photoelectric effect?
A. Electromagnetic waves strike a semiconductor, removing some of
its electrons, which form a current,
B. Electromagnetic waves act according to the wave model of light,
not the particle model.
C. Electrons flow from the negatively charged semiconductor to the
positively charged one.
D. Electromagnetic waves remove electrons from the transparent
glass on the top of the cell.
Explanation:
Photovoltaic energy is a clean, renewable source of energy that uses solar radiation to produce electricity. It is based on the photoelectric effect—the emission of electrons when electromagnetic radiation (i.e. light) hits a material.
Answer:
electromagnetic waves strike a semiconductor , removing some of the electrons ,which form a current
Explanation:
aPe~X!
10. When a car turns, its front wheels do not turn by the same amount. In order that the car turn around a common point, the wheel on the side to which the car is turning, turns more than the other. Which of these correctly shows the alignment of a car's wheels when it is turning to its right?
Answer:
The front wheels are aligned towards the right.
Explanation:
Wheel alignment is very important. It ensures proper maintenance of the car's wheel. When a car turns around a common point, the wheel on that side to which the car turns, the turning is more than the other.
The wheel alignment consists of adjusting the wheel's angles so as to stay perpendicular to the surface of the road and to ensure proper tract to the tires. It also provides maximum life to the tire. The front wheels are aligned to the right when the car makes a right turn and the wheel leans in towards the center of the car.
Magnesium is a shiny, flexible metal that can be burned in the presence of air.
When it is burned, it produces a white powder that is no longer shiny or flexible.
This white powder also has more mass than the original magnesium. *
The molecules were separated into individual atoms.
The mass of the magnesium changed.
Smoke that was trapped between the magnesium atoms was given off.
A new substance wa formed
Explain why you chose the above answer. *
Your answer
Answer:
A new substance was formed
Explanation:
According to this question, a shiny and flexible metal called Magnesium (Mg) is burnt in air to produce a white powder that has no shiny or flexible properties, however, has more weight than the magnesium metal itself.
This is possible because a CHEMICAL CHANGE has occured, hence, a new substance has been formed. The formation of a new substance during the burning process (chemical reaction), induced the increase in mass.
Where does the force come from that propels a rocket forward?
Answer:
Newtons law of equal and opposite reactions
Explanation:
This is my best guess I'm sorry if it's not helpful
If speed is measured in meters per second and time is measured in second, the unit of acceleration is
Answer:
meters per second squared or meters per second per second
Explanation:
If speed is measured in meters per second and time is measured in second, the unit of acceleration is "meters per second squared or meters per second per second."
To illustrate better, speed is measured in meters per second = m/s, while time is measured in second = s.
Hence, the unit of acceleration is m/s². This implies that acceleration is the number of meters per second the velocity changes every second.
You and your little cousin sit on a see-saw. You sit 0.5 m from the fulcrum, and your cousin sits 1.5 m from the fulcrum. You weigh 600 N. How much does she weigh?
Answer:
200N
Explanation:
Distance from fulcrum by you = 0.5m
Distance from fulcrum by cousin = 1.5m
Your weight = 600N
Unknown:
Weight of my cousin = ?
Solution:
From the principle of moment, when an object is balanced, the sum of the clockwise moment is equal to the sum of the anti-clockwise moment.
So;
Your weight x distance from fulcrum by you = Weight of cousin x her distance from the fulcrum
600 x 0.5 = weight of cousin x 1.5m
Weight of cousin = 200N
a measure of how far an object has moved from a starting point
Choose one thing in each label to identify the parts of DNA
Label A: Chorosome, genes, nitrogen bases, or sugar phosphate backbone
Label B: Chorosome, genes, nitrogen bases, or sugar phosphate backbone
P.S (WILL GIVE BRAINILIST IF YOU HELP! P.P.S (I don’t know what subject of science this is so I just picked physics)
pls guys what is displacement
Answer:
Displacement is the shortest distance from your initial position to your final position. Therefore, displacement is a measurement of distance and not an "end-point."
Explanation:
Displacement is a difference between an initial value and a final value, not factoring in any changes that happen in between. For example you let an object of a certain volume sink to the bottom of a container of water, the water level will be displaced, or changed, by exactly the volume of that object.
Example: A marble with volume of 3 cm³ is dropped into a graduated cyllinder with 10 mL of water. The water level rises to the 13 mL mark, so the displacement of the water by the marble is exactly 3 mL.
This doesn't just apply to a change in volume: If I move a box 3 meters along an axis in the positive direction, we say its displacement along that axis is 3 meters. If I moved it in the negative direction the same distance, the displacement would be -3 meters.
PLEASE HELP ME
When an object is struck and sound is produced, explain the direction of the sound wave.
Answer:
The sound goes in every direction, except into the two objects that make contact.
Explanation:
The waves need somewhere to go, but can't travel into the two objects that were struck, so therefore the sound explodes forth in every which way and ends up in your ear.
At the time when the object should be struck and the sound should be generated so here the direction should be at each and every direction but does not make any contact.
What is a sound wave?It is the wave that develop the disturbance pattern which leads into the energy movement that should be traveled via the medium like the air, water, etc. Also, it leads to the vibration like when the phone is ringed or the vocal cords of the person.
hence, At the time when the object should be struck and the sound should be generated so here the direction should be at each and every direction but does not make any contact.
Learn more about waves here: https://brainly.com/question/21849636
How much work is done on a small car if a 3150 N force is exerted to move it 75.5 m to the side of the road?
Answer:
W = 237825 [J]
Explanation:
Work in physics is defined as the product of force by the distance that the body travels.
The work can be calculated by means of the following equation.
[tex]W =F*d[/tex]
where:
W = work [J] (units of Joules)
F = force = 3150 [N]
d = distance = 75.5 [m]
Now replacing:
[tex]W=3150*75.5\\W=237825 [J][/tex]
A difference between mechanical and electromagnetic waves is
a. Only mechanical waves can measure frequency
b. Only electromagnetic
waves travel through gas particles
c. Only electromagnetic waves travel
through space
d. Only mechanical waves include light
Answer:
c. Only electromagnetic waves travel through space
Explanation:
Electromagnetic waves are the only waves that travels through space or vacuum.
These waves do not require any material medium for their propagation as the case may be.
Mechanical waves requires a material medium before they can be propagated. But mechanical waves do not require any medium. They readily move through space without any attenuation. This is the salient difference between electromagnetic and mechanical waves.PLEASE HELP ME I WILL GIVE BRAINLYEST!!
The gravitational pull of Jupiter is greater than the gravitational pull of Earth. How would adding a “JUPITER MODE” to the virtual activity change the results of Galileo’s experiment?
Answer:
It wouldn't do this because the gravity of Jupiter is 2 and ½ times more powerful than here on Earth.
Explanation:
Brainliest?
No change in the results of Galileo’s experiment happens on adding a “JUPITER MODE” to the virtual activity .
What is the results of Galileo’s experiment (Pisa tower experiment)?Galileo noticed that when two objects are dropped from a certain height, they both fall to the ground at the same time.From a specific height, all bodies of any mass will fall simultaneously and at the same moment. That means that all bodies in free fall accelerate at the same rate. We are aware that the force to mass ratio determines acceleration.In the same force field, a larger body experiences more force than a smaller one. This means that for all free-falling bodies, acceleration is constant.The gravitational pull of Jupiter is greater than the gravitational pull of Earth. But these pulls are same for all masses. So, again all bodies of any mass will fall simultaneously and at the same moment. Hence, no change in the results of Galileo’s experiment happens.
Learn more about gravity here:
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If a 0.75 efficient motor produces 150 W of useful power, what was the input power? *
Answer:
The input power is 200 W
Explanation:
Motor Efficiency
The efficiency of a motor can be calculated as follows:
[tex]\displaystyle \beta=\frac{P_o}{P_i}[/tex]
Where:
β = efficiency
Po = Output power
Pi = Input power
Solving for Pi:
[tex]\displaystyle P_i=\frac{P_o}{\beta}[/tex]
The efficiency is β=0.75 and the output power is Po=150 W, thus the input power is:
[tex]\displaystyle P_i=\frac{150}{0.75}[/tex]
[tex]P_i=200 \ W[/tex]
The input power is 200 W
Why dont you fall through walls when you lean against them? provide a scientific explanation to explain your answer.
Answer:
That's why if you lean against the wall, you don't just fall through it. The wall pushes back on you as hard as you push on it, and you and the wall stay in place. If you throw something, you put more force behind it than just leaning on it, so it pushes back with more force.
Explanation:
PLEASE MARK ME AS BRAINLIEST
find mass when kinetic energy is 1.6 J and velocity is 0.2 m/s
Answer:
4kg
Explanation:
Given parameters:
Kinetic energy = 1.6J
Velocity = 0.2m/s
Unknown:
Mass of the body = ?
Solution:
The kinetic energy of a body is the energy due to the motion of the body.
It is mathematically expressed as;
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
1.6 = [tex]\frac{1}{2}[/tex] x 0.2 x v²
1.6 = 0.1v²
v² = 16
v = 4kg
To remove a nut from an old rusty bolt, you apply a 100-N force to the
end of a wrench perpendicular to the wrench handle. The distance from
the applied force to the axis of the bolt is 25 cm. What is the torque
exerted on the bolt in N-m?
Answer:
yes its 25cmjdj8dnen8dnejdid
You need to calibrate your giant paintball bazooka, so you're fired at an angle of 60° and you find that the giant paintball splatter the ground at a horizontal distance of 107m from the end of the muscle in a distance of 1.7 M below the end of the muzzle. What is the muzzle velocity, V0, of your giant paint ball bazooka?
Answer:
Vx = V0 cos 60 = V0 ./ 2 horizontal speed
Vy = V0 sin 69 = V0 * .866 = .866 V0 vertical speed
t = 107 / Vx = 214 / V0 time to travel 107 m
h = Vy t - 1/2 * g t*2 time to fall 1.7 m
-1.7 = .866 V0 * 214 / V0 - 4.9 * (214 / V0)^2 substituting
224400 / V0^2 = 187
V0 = (224400 / 187)^1/2 = 2=34.64 m/s
t = 214 / 34.64 = 6.178 stc
Check: h = Vy t - 1/2 g t^2
-1.7 = .866 * 34.64 * 6.178 - 4.9 * 6.178^2
-1.7 = -1.69
Estimate how long the Sun would last if it were merely a huge fire that was releasing chemical energy. Assume that the Sun begins with roughly 108 joules per kilogram, a chemical energy content typical of atomic matter. You will need both the mass and luminosity of the Sun to do the calculation.
Answer:
You don't need to worry about this solar death anytime soon, though. Inside the sun, a churning fusion engine fuels the star, and it still has a lot of fuel left — about 5 billion years' worth.
Astronomers estimate that the sun has about 7 billion to 8 billion years left before it sputters out and dies. Humanity may be long gone by then, or perhaps we'll have already colonized another planet. Additional resources: Find out what will happen to the Earth when the sun dies, from Live Science.
The studies suggest that the solar system’s planets will continue to orbit the Sun stably for at least 40 million years. But after that, they show there is a small but not insignificant chance that things could go terribly awry.
In one of Batygin and Laughlin’s simulations, Mercury was thrown into the Sun 1.3 billion years from now. In another, Mars was flung out of the solar system after 820 million years, then 40 million years later Mercury and Venus collided.
Explanation:
Please help me with this!!
Answer:
yes it is correct
Explanation:
A voltmeter is used to measure potential energy difference, voltage across a circuit component.
and a voltmeter is always connected in parallel with the circuit component you are measuring.
What is the mass of a skateboard that is accelerating at 7 m/s when it is pushed with 49N?
Pls
Answer:
m = 7 kg
Explanation:
F = m × a
49 = m × 7
7m = 49
m = 49/7
m = 7 kg
A 1232 kg car moving north at 25.6 m/s collides with a 2028 kg car moving north at 17.5 m/s . They stick together. In what direction and at what speed do they move after the collision?
Answer:
I. Angle = 41.7° Northeast.
II. Vr = 7.08m/s
Explanation:
Let the two cars be denoted by A and B
Given the following data;
Mass of car A = 1232 Kg
Velocity of car A = 25.6 m/s
Mass of car B = 2028 Kg
Velocity of car B = 17.5m/s
First of all, we would solve for momentum;
Momentum = mass × velocity
Momentum, M1 = 1232 × 25.6
Momentum, M1 = 31539.2 Kgm/s
Momentum, M2 = 2028 × 17.5
Momentum, M2 = 35490 Kgm/s
Now, let's find the resultant momentum using the Pythagoras theorem;
R² = M1² + M2²
R² = 31539.2² + 35490²
R² = 994721136.6 + 1259540100
R² = 2254261237
Taking the square root of both sides, we have
Resultant momentum, R = 47479.06 Kgm/s
To find the direction;
Angle = tan¯¹(M1/M2)
Angle = tan¯¹(31539.2/35490)
Angle = tan¯¹(0.89)
Angle = 41.7° Northeast.
To find the speed;
R = (M1 + M2)Vr
47479.06 = (31539.2 + 35490)Vr
47479.06 = 67029.2Vr
Vr = 47479.06/67029.2
Vr = 7.08m/s
WILL MARK BRAINLIEST (real answers only please)
A driver on a rural road slams on the brakes to avoid hitting a cow and comes to a stop. Skid marks made while the brakes were applied are 280 feet long. If the tread on the tires produced a coefficient of kinetic friction of 0.3 with the road, how fast was the car moving? 1 m/s=2.237 mph.
35 mph
25 mph
45 mph
50 mph
Answer:
The car moving with speed 50 mph
Explanation:
We are given that
Distance, s=280 feet=85.3 m
1 feet=0.3048 m
Coefficient of kinetic friction=[tex]\mu_s=0.3[/tex]
1 m/s=2.237 mph
We have to find the speed of car moving.
Speed, v=[tex]\sqrt{2\mu_s gs}[/tex]
Where [tex]g=9.8ms^{-2}[/tex]
Using the formula
Speed of the car,v=[tex]\sqrt{2\times 0.3\times 9.8\times 85.3}[/tex]
Speed of the car,v=22.4 m/s
Speed of the car, v=[tex]22.4\times 2.237\approx 50 mph[/tex]
Hence, the car moving with speed 50 mph
Option d is true.
compare and contrast the theories about the origin of the universe
Answer:
The best-supported theory of our universe's origin centers on an event known as the big bang. This theory was born of the observation that other galaxies are moving away from our own at great speed in all directions, as if they had all been propelled by an ancient explosive force.
Explanation:
hope this helps tho i don't quite know what you mean
Pls ans briefly explain
Answer:
The force of gravitational will decreases by a factor of 4
Explanation:
The given parameters are;
The symbol that represents the given mass = m
The mass of the circular ring = M
The initial distance of the mass "m" located at the point P from the center O = h
The final distance of the mass "m" when moved further away from point O = 2·h
Given that h = r, we have;
[tex]The \ initial \ gravitational \ force, F_1 =G \cdot \dfrac{M \cdot m}{r^{2}}[/tex]
Therefore, when OP = 2·h, we have;
OP = 2·r and the new gravitational force, F₂, is given as follows;
[tex]F_2 =G \cdot \dfrac{M \cdot m}{(2\cdot r)^{2}} = G \cdot \dfrac{M \cdot m}{4\cdot r^{2}} = \dfrac{1}{4} \times G \cdot \dfrac{M \cdot m}{r^2} = \dfrac{1}{4} \times F_1[/tex]
[tex]\therefore F_2 = \dfrac{1}{4} \times F_1[/tex]
Therefore, when the mass, m, is removed such that OP = 2h, the value of the gravitational force decreases by a factor of 4.
Help me plzzz
And thank u
Answer:
$ 1.1
Explanation:
From the question given above, the following data were obtained:
Cost per kWh = $ 0.1
Current (I) = 10 A
Voltage (V) = 220 V
Time (t) = 5 h
Cost of operation =?
Next, we shall determine the power the electric oven. This can be obtained as follow:
Current (I) = 10 A
Voltage = 220 V
Power (P) =?
P = IV
P = 10 × 220
P = 2200 W
Next, we shall convert 2200 W to KW. This can be obtained as follow:
1000 W = 1 KW
Therefore,
2200 W = 2200 W × 1 KW / 1000 W
2200 W = 2.2 KW
Thus, 2200 W is equivalent to 2.2 KW.
Next, we shall determine the energy consumed by the electric oven. This can be obtained as follow:
Power (P) = 2.2 KW
Time (t) = 5 h
Energy (E) =?
E = Pt
E = 2.2 × 5
E = 11 KWh
Finally, we shall determine the cost of operation. This can be obtained as follow:
1 KWh cost $ 0.1
Therefore,
11 KWh will cost = 11 × 0.1
11 KWh will cost = $ 1.1
Therefore, the cost of operating the electric oven is $ 1.1
Any form of stored energy is called ______ energy
what is in the blank
Answer: Potential energy
Explanation:
Any form of stored energy is called potential energy. (option b)
Potential energy can come in various forms. Gravitational potential energy is associated with an object's position concerning the Earth's gravitational field. The higher the object, the more potential energy it possesses. Elastic potential energy is stored in objects like springs or rubber bands when they are compressed or stretched. Chemical potential energy is stored in the bonds between atoms and molecules in substances like food or fuel.
Remember, potential energy is a concept that helps us understand the ability of an object or a system to perform work or change its state based on its position or condition.
Hence the correct option is (b).
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Complete Question:
Any form of stored energy is called ______ energy
a) Solar
b) Potential
c) Wind
A 8.0-kg ball is thrown towards a wall with a speed of 9.0 m/s. The ball hits the wall and rebounds backward with a speed of 2.0 m/s. What is the momentum change experienced by the ball?
Answer:
DP = 56 [kg*m/s]
Explanation:
We know that momentum is defined by the product of mass by Velocity. In this way by means of the following equation, we can calculate the impulse.
[tex]P=m*v\\[/tex]
where:
P = momentum [kg*m/s]
m = mass [kg]
v = velocity [m/s]
Now replacing:
[tex]P=8*9\\P=72[kg*m/s][/tex]
And after the ball hits the wall:
[tex]P_{2}=8*2\\P_{2}=16[kg*m/s][/tex]
The change in momentum is equal to:
[tex]DP=72-16\\DP = 56 [kg*m/s][/tex]
