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
3) Circle the right alternative.
i) The process of using a material of low thermal conductivity to prevent heat loss is
called
a) cooling
b) lagging
C absorption
d) contraction
ii) Metals are good conductors of heat because
(a) they are ductile
(b) they contain free protons
(C) they contain loose electrons (d) their atoms can be easily
displaced
iii) On a cool day, a metal feels cold to the touch because
a) metals contain less heat
b) the temperature of the metal is the same as that of the surroundings
c) the temperature of the metal is less than that of the surroundings
d) the metal conducts the heat away from the hand.
Answer:
1) C (I think)
2) C
3) D
Explanation:
I know that 2 and 3 are correct. just not sure about 1
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
Why is an element considered a pure substance?
im i right
An element is considered a pure substance because it is made up of only one type of atom and cannot be broken down into a simpler form.
Answer:
Explanation:
right
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:
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
Four atoms of hydrogen combine with one carbon atom to form CH4, but only two hydrogen atoms combine with one oxygen atom to form H2O. Which of the following helps to explain why?
Hydrogen has one valence electron.
Oxygen has two vacancies in its electron shell, but carbon has four vacancies.
Metallic bonds form between positively charged metal ions and delocalized electrons.
Atoms may share electrons in order to fill their electron shells.
Answer:
Oxygen has two vacancies in its electron shell, but carbon has four vacancies.
Explanation:
Oxygen has vacant space for two electrons in its outermost shell. Hence, it can accommodate two electrons from two hydrogen atoms. This leads to the formation of the H₂O molecule. On the other hand, the Carbon atom has vacant space for four electrons. Hence, it can accommodate four electrons from four hydrogen atoms. This leads to the formation of the CH₄ molecule.
In this way the explanation can be provided by the following statement:
Oxygen has two vacancies in its electron shell, but carbon has four vacancies.
Answer:
-Atoms may share electrons in order to fill their electron shells.
- Hydrogen has one valence electron.
- Oxygen has two vacancies in its electron shell, but carbon has four vacancies.
Explanation:
just did it
Why can a device never be 100% efficient? Explain.
Answer:
No machine is free from the effects of gravity, and even with wonderful lubrication, friction always exists. The energy a machine produces is always less than the energy put into it (energy input). ... That is why 100% efficiency in machines shall not be possible.
Answer:The output work is always less than the input work because some of the input work is used to overcome friction. Therefore, efficiency is always less than 100 percent.
Explanation:
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.
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
A people mover has a velocity of 1 m/s, VF, and is 150 m, XF, long. If a man walks 2 m/s, VI, relative to the people mover, how long will it take him to
reach the opposite end if he walks in the direction that the people mover travels?
Which energy from the choices given is the strongest
Visible Light
Microwaves
UV Light
X-Rays
Answer:
X-Rays
Explanation:
WILL MARK THE BRAINLIEST
pls help
Answer:
I think B but im not sure
Explanation:
Answer: i think both mirrors are used to reflect the beam of light.
Explanation:
gr 10 science right? im almost done the semester and i learnt this already so i think the best answer is the last one
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
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.
What is the momentum of a 0.255kg apple falling at 16.0 m/s
a measure of how far an object has moved from a starting point
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
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
Which of these can be used to find the volume of a juice box?
A: mass divided by volume
B: mass•weight•length
C: mass divided by weight
D: length•width•height
Answer:
Legth * width* height is how u find volume
Explanation:
3. Why is a subducting plate boundary considered a type of
convergent plate boundary?
Answer:
✔ convergent
Explanation:
Answer:
B ( Convergent)
Explanation:
How far does an object travel if it starts from rest and accelerates at a rate of 2.0 meters per second2 for 6.5 seconds?
Answer:
42.25 m
Explanation:
According to the question;
u = 0 m/s (journey started from rest)
a = 2 m/s^2
t = 6.5 secs
Given that;
s = ut + 1/2at^2
s = (0 * 6.5) + 1/2 * 2 * (6.5)^2
s = 0 + 42.25
s = 42.25 m
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.
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).
To know more about energy here
https://brainly.com/question/1932868
#SPJ6
Complete Question:
Any form of stored energy is called ______ energy
a) Solar
b) Potential
c) Wind
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:
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.
Please show the work and steps. The answer is (3.3 s, 15 m/s)
Answer:
t = 3.3 s and V = 15 m/s
Explanation:
Given that,
Distance covered by the car, d = 50 m
Initial speed, u = 5 m/s
Final speed, v = 25 m/s
Firstly we can find the acceleration of the car using third equation of motion. i.e.
[tex]v^2-u^2=2as\\\\a=\dfrac{v^2-u^2}{2d}\\\\a=\dfrac{(25)^2-(5)^2}{2(50)}\\\\a=6\ m/s^2[/tex]
Let t is the time taken by the car to occur this.
[tex]t=\dfrac{v-u}{a}\\\\t=\dfrac{25-5}{6}\\\\t=3.3\ s[/tex]
Let v is the average velocity of the car. It can be calculated as follows :
[tex]V=\dfrac{u+v}{2}\\\\V=\dfrac{25+5}{2}\\\\V=\dfrac{30}{2}\\\\V=15\ m/s[/tex]
So, the time taken by the car to occur this is 3.3 seconds and the average velocity of the car is 15 m/s.
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
need help in is psychology
Answer:
D. The General Adaptation Syndrome
Explanation:
Hans Selye, an endocrinologist, developed the "Stress Theory." He showed the relationship of "stress" to the person's development of disease.
Under stress, a person's body experiences changes. The person tries to cope with these through three stages: Alarm Reaction Stage, Resistance Stage and Exhaustion Stage. It is at the last stage that a person's immune system is placed at a huge risk. Once the person is exposed to a stressor for a period of time, he becomes hopeless and his body tends to give up coping. He then succumbs to stress-related illness.
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
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]
