If something is living it usually has to eat something to thrive, for example a tree photosynthesis to get the nutrition it needs while a rock just sits there and isn't living.
Answer:
To be considered living it have to use energy, it has to be made of cells. Something living is also referring to things that were once living
Explanation:
If there is 10% sales tax on a car costing $18,000
How much is the sales tax?
O $180
O $1800
O $1.80
O $800
Answer:
180
Explanation:
i think
Wooden handles on knives do not require maintenance.
TRUE
FALSE
Answer: false
Explanation:
You have to make sure it doesn’t stay wet
Fun fact
An apple, potato, and onion all taste the same if you eat them with your nose plugged
Answer:
Fun fact
An apple, potato, and onion all taste the same if you eat them with your nose plugged
Explanation: yes
15% input work is lost due to friction then what is the efficiency of machine?
Answer:
I think 50%
Explanation:
Because the efficiency of a machine is always less than 100%. And efficiency of a machine is 75%.
So, if 15% input work is lost due to friction then efficiency is maybe 50%.
The Indianapolis Motor Speedway has four banked curves, each of which forms a quarter of a circle. Suppose a race car speeds along one of these curves with a constant tangential speed of 75.0 m/s. Neglecting the effects due to the banking of the curve, the centripetal acceleration on the car is 22.0 m/s2. What is the radius of the curve?
Answer:
r = 255.68 m
Explanation:
When a body moves in a circular path, an acceleration, due to constant change in its direction, is developed, known as centripetal acceleration. The centripetal acceleration acts towards the center of the circular path. The formula to calculate the centripetal acceleration is given as follows:
ac = v²/r
where,
ac = centripetal acceleration = 22 m/s²
v = tangential speed = 75 m/s
r = radius of curve = ?
Therefore,
22 m/s² = (75 m/s)²/r
r = (75 m/s)²/(22 m/s²)
r = 255.68 m
A car accelerates from 2 m/s to 5 m/s in 1.8 seconds. What is the acceleration of the car?
Answer:
5-2 / 1.8 = 1.66m/s
Explanation:
acceleration = vf-vi / t
vf= 5m/s
vi= 2m/s
t= 1.8 s
a student drops a tennis ball from rest. the ball falls 13m to the ground.find the final speed of the ball,just before it reaches the ground
[tex] ({v})^{2} - ({v(0)})^{2} = 2 \times a \times ∆x[/tex]
[tex]v = the \: \: speed \: \: before \: \: reaching \: \: ground \\ [/tex]
[tex]v(0) = the \: \: speed \: \: in \: \: the \: \: rest \: \: which \: \: is \: \: zero \\ [/tex]
[tex]a = Acceleration \: = \: Gravity \: \: acceleration = 10 \\ [/tex]
[tex]∆x = covered \: \: distance[/tex]
_________________________________
[tex] {v}^{2} - ({0})^{2} = 2 \times 10 \times 13 [/tex]
[tex] {v}^{2} = 2 \times 2 \times 5 \times 13 [/tex]
[tex]v = \sqrt{ {2}^{2} \times 65 } [/tex]
[tex]v = 2 \sqrt{65} \: \: \frac{m}{s} [/tex]
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Paco was driving his scooter west with an initial velocity of 4 m/s. He accelerates at 0.5 m/s for 30 seconds.
What is his final velocity?
O 2 m/s
O 8 m/s
O 19 m/s
O 60 m/s
Answer:
the answer is 19 ,30 (second) times 0.5= 15
15+4= 19
After Paco drives his scoter west with an initial velocity of 4 m/s and then accelerates at 0.5 m/s² for 30 s, his final velocity is 19 m/s, so the correct option is the fourth.
The final velocity of Paco can be calculated with the following equation:
[tex] v_{f} = v_{i} + at [/tex]
Where:
[tex] v_{f}[/tex]: is the final velocity =?
[tex]v_{i}[/tex]: is the initial velocity = 4 m/s
a: is the acceleration = 0.5 m/s²
t: is the time 30 s
Hence, the final velocity is:
[tex] v_{f} = 4 m/s + 0.5 m/s^{2}*30 s = 19 m/s [/tex]
Therefore, the correct option is 19 m/s.
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A program can only create one object of each class.
A. True
B. False
A mover's dolly is used to pull a 115 kg refrigerator up a ramp
into a house. The ramp is 2.10 m long and rises 0.850 m. The
mover exerts a force of 496 N up the ramp. How much work is
spent overcoming friction?
Answer:
84 J
Explanation:
Work by mover:
W = Fd
W = 496 J (2.1 m)
W = 1042 J
Work by dolly and ramp:
W = Fd
W = (mg)d
W = 115 kg (9.8 m/s/s) (0.85 m)
W = 958 J
1042 J - 958 J
= 84 J
The amount of work spent in overcoming friction is 83.65 J.
From the question,
The amount of work spent in overcoming friction = work done by the mover-potential energy of the refrigerator.
This is expressed mathematically as,
W' = Fd-mgh................... Equation 1
Where W' = work spent against friction, F = force applied, d = distance, m = mass of the refrigerator, g = acceleration due to gravity, h = height.
From the question,
Given: F = 496 N, d = 2.10 m, m = 115 kg, h = 0.85 m
Constant: g = 9.8 m/s².
Substitute these values into equation 1
W' = 496(2.1)-(115×9.8×0.85)
W' = 1041.6-957.95
W' = 83.65 J.
Hence, the amount of work spent in overcoming friction is 83.65 J
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What is the mass of a person who weighs 500 N?
Answer:
51 kg
Explanation:
Answer:
51kg
Explanation:
So his mass is Weight/gravity=500 N / 9.8 m/s^2 = 51 kg.
What keeps the sun shining
Answer:
The Sun shines by turning hydrogen into helium in its core.
Explanation:
This process is called nuclear fusion. Fusion happens when lighter elements are forced together to become heavier elements. When this happens, a tremendous amount of energy is created.
A bowling ball is rolling down the lane at a constant velocity of 7.5 m/s. If the bowling ball travels 18 m down the entire lane, how long does it take for the ball to reach the end?
Answer:
The answer is 2.4 sExplanation:
To find how long it took the ball to reach the end we use the formula
[tex]t= \frac{d}{v} \\ [/tex]
where
t is the time
d is the distance
v is the velocity
From the question
d = 18 m
v = 7.5 m/s
We have
[tex]t = \frac{18}{7.5} \\ [/tex]
We have the final answer as
2.4 sHope this helps you
Do Gamma Rays tend to behave like a particle or a wave?
true or false
Impulse is defined as the force exerted on an object times the time it lasts.
Answer: true
Explanation: when two objects collide and completely bounce apart with no lasting deformation or generation of heat, the collision is said to be elastic.
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a car drives 16 m east, then 25 m south, then 16 m west. calculate the distance travelled by car
Answer:
16m + 25m + 16m = 57m
the car travelled 57 m
A sports car has a mass of 1,460kg and accelerates at 2.04 meters per second squared. What is the magnitude of the force acting on the sports car?
Answer:
The answer is 2978.4 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × accelerationFrom the question
mass = 1,460kg
acceleration = 2.04 m/s²
We have
force = 1460 × 2.04
We have the final answer as
2978.4 NHope this helps you
What are three key aerodynamics principles?
A Drag, height, and acceleration
B Drag, downforce, and drafting
C Acceleration, downforce, and motion D Acceleration, height, and motion
Answer:
A
Explanation:
There are three basic forces in aerodynamics: acceleration, which moves an airplane forward; drag, which holds it back; and height, which keeps it airborne. Lift is generally explained by three theories: Bernoulli's principle, the Coanda effect, and Newton's third law of motion.
"A car is travelling at 70 m/s. The driver sees a cow in the road and slows down with a constant acceleration for 10 seconds before coming to a stop. What is the car’s displacement by the time is stops." what information do you know?
The question does not ask for anything in particular. I will calculate the acceleration and distance.
Answer:
The acceleration of the car is [tex]-7\ m/s^2[/tex]
The distance traveled before stopping is 350 m
Explanation:
Constant Acceleration Motion
It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.
Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:
[tex]v_f=v_o+at\qquad [1][/tex]
The distance traveled by the object is given by:
[tex]\displaystyle x=v_o.t+\frac{a.t^2}{2}\qquad [2][/tex]
The car has an initial speed of v0=70 m/s when the driver sees a cow in the road and steps on the brakes with an (assumed) constant acceleration during t=10 seconds before stopping (vf=0).
With the information provided, we can calculate the value of the acceleration and the distance traveled.
Using the equation [1] we can solve for a:
[tex]\displaystyle a=\frac{v_f-v_o}{t}[/tex]
Substituting the numerical values:
[tex]\displaystyle a=\frac{0-70}{10}=-7\ m/s^2[/tex]
The acceleration of the car is [tex]-7\ m/s^2[/tex]
The distance is now calculated by using [2]
[tex]\displaystyle x=70\cdot 10+\frac{(-7)\cdot 10^2}{2}[/tex]
[tex]\displaystyle x=700-\frac{700}{2}=350\ m[/tex]
The distance traveled before stopping is 350 m
You use 35 joules of energy to move a 7 newton box. How far did you move it?
If you picked it straight up, you lifted it 5 meters.
If you moved it horizontally, it could be ANY distance.
Answer:
5
Explanation:
distance = work / force
d = 35 J / 7 N
d = 5 m
How long will it take you to reach the cafeteria if it is 75 m away and you can travel at an average speed of 2 m/s down the stairs?
Does the mass of an object dictate the acceleration of
a falling object
Answer:
No.
Explanation:
Because the acceleration of falling objects is constant and is not affected by mass
Answer: no
The acceleration of an object is equivalent to the gravitational acceleration. The size, shape, and weight of an item are not a cause in the motion of the object. So all objects, regardless of its mass, size, or shape fall freely with the same acceleration.
1. In boxing, fighters wear padded gloves to protect their hands. Which statement explains why a fighter’s hands need protection?
A. There is an equal and opposite velocity impact the hand.
B. There is an equal and opposite acceleration impact the hand.
C. There is an equal and opposite momentum impacting the hand.
D. There is an equal and opposite force impacting the hand.
2. Two balls collide. Under which circumstances will they exert equal and opposite forces on each other?
A. If the sustem is closed
B. in all situations
C. If both are moving at the same speed when they collide
D. if they have the same mass
3. In a closed system, how does an increase in mass change the velocity of an impacted object?
A. Velocity decreases to conserve momentum.
B. Velocity may increase or decrease depending on acceleration.
C. Velocity may increase or decrease depending on force.
D. Velocity increases to conserve momentum.
4. Which of the following provides the correct equation for calculating the momentum of an object?
A. p= mv
B. m= DV
C. F= ma
D. m= vp
5. An object with a mass of 50 kg is moving at a velocity of 2 m/s. What is the momentum of the object?
A. 2 kg*m/s
B. 0.04 kg*m/s
C. 100 kg*m/s
D. 25 kg*m/s
6. A large train car moving along a horizontal track rolls into a smaller stationary train car, causing the cars to attach. Which statement best describes the motion of the cars after the connection?
A. The train cars move in the opposite directions from each other.
B. The train cars move together in the opposite direction the large car was moving.
C. The train cars move together in the direction the large car was moving.
D. The train cars both stay stationary.
7. Which equation correctly represents conservation of momentum for two colliding objects?
A. m1a1+m2a2=0
B. m1v1-m2v2=0
C. m1a1-m2a2=0
D. m1v1+m2v2=0
8. How can the sum of two vectors be found?
A. by drawing the vectors perpendicular to each other
B. by adding the numbers representing the vectors' magnitudes
C. by subtracting the numbers of the vectors' magnitudes
D. by drawing the vectors one right after the other
9. How could a closed system be changed without changing the net force on that system?
A. decrese the acceleration only
B. increase the mass and decrease the acceleration by the same numeric values
C. decrease the acceleration and decrease the mass by the same numeric values
D. increase the mass only
10. Which phrase best describes acceleration?
A. the produce of mass and velocity
B. the change in position over time
C. the product of force and distance traveled
D. the change in velocity over time
11. A ball rolls down a hill at constant velocity. Which of the following conditions must be true?
A. The ball will accelerate as gravity pulls it down the hill.
B. The ball has no net force acting on it.
C. There are no forces acting on the ball.
D. The momentum of the ball increases over time.
12. In an experiment, objects 1 and 2 with masses m1 and m2, respectively, collide with each other. The objects have initial velocities v1i and v2i and final velocities v1f and v2f, respectively. Which result would prove conservation of momentum?
A. m1v1i+m2v2i=m1v1f+m2v2f
B. m1v1i+m1v1f=m2v2i+m2v2f
C. m1v1i+m2v2i+m1v1f+m2v2f>0
D. m1v1i+m2v2i+m1v1f+m2v2f=0
Answer:
1.) D. There is an equal and opposite force impacting the hand
2.) B. In all situations
3.) A. Velocity decreases to conserve momentum
4.) A. p=mv
5.) C. 100 kg*m/s
6.) C. The train cars move together in the direction the large car was moving
7.) D. m1v1+m2v2=0
8.) D. By drawing the vectors one right after the other
9.) B. Increase the mass and decrease the acceleration by the same numeric values
10.) D. The change in velocity over time
11.) B. The ball has no net force acting on it
12.) A. m1v1i+m2v2i=m1v1f+m2v2f
Explanation:
Did the practice
(1) The fighters wear padded gloves to protect their hands because there is an equal and opposite force impacting the hand.
(2) The two balls when collide in a closed system will exert equal and opposite force.
(3) When the mass of the object increases, the velocity of the object will decrease to conserve momentum.
(4) The equation for calculating the momentum of an object is P = mv
(5) The momentum of the ball is 100 kg.m/s
(6) The train cars move together in the direction the large car was moving.
(7) The conservation of momentum of two objects is [tex]m_1v_1 - m_2v_2= 0[/tex]
(8) The sum of two vectors can be found by drawing the vectors perpendicular to each other.
(9) A closed system can be changed without changing the net force on the system by increase the mass and decrease the acceleration by the same numeric values.
(10) Acceleration is defined as the change in velocity over time.
(11) As ball rolls down at constant velocity, the ball has no net force acting on it.
(12) The conservation of momentum of the object is [tex]m_1v_1_i + m_2v_2_i = m_1v_1_f + m_2v_2_f[/tex]
(1)
According to Newton's third law of motion, action and reaction are equal and opposite.
The fighters wear padded gloves to protect their hands because there is an equal and opposite force impacting the hand.
(2)
Based on the principles of conservation of linear momentum, the two balls when collide in a closed system will exert equal and opposite force.
(3)
The principles of conservation of linear momentum is written as;
[tex]m_1u_1 + m_2u_2 = m_1v_1 + m_2v_2[/tex]
when the mass of the object increases, the velocity of the object will decrease to conserve momentum.
(4)
The equation for calculating the momentum of an object is written as;
P = mv
(5)
The momentum of the ball is calculated as follows;
P = mv
P = 50 x 2
P = 100 kg.m/s
(6)
For inelastic collision, the collided two objects move in the same direction after collision usually in the direction of heavier object.
The train cars move together in the direction the large car was moving.
(7)
The conservation of momentum of two objects is written as;
[tex]m_1v_1 = m_2v_2\\\\m_1v_1 - m_2v_2 = 0[/tex]
(8)
The sum of two vectors can be found by drawing the vectors perpendicular to each other.
(9)
A closed system can be changed without changing the net force on the system by increase the mass and decrease the acceleration by the same numeric values.
(10)
Acceleration is defined as the change in velocity over time.
(11)
At constant velocity , acceleration = 0
∑F = ma
∑F = m x 0
∑F = 0
Thus, as ball rolls down at constant velocity, the ball has no net force acting on it.
(12)
The conservation of momentum of the object is written as;
[tex]m_1v_1_i + m_2v_2_i = m_1v_1_f + m_2v_2_f[/tex]
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What is electricity and where does it come from?
Answer:
it is created power we use everyday
electricity is made of the flow of electrons.
but its made by a generated by a power plant bye electric generators
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An object has a density of 0.755 g/mL. Its volume is 640 mL. What is its mass?
Answer:Density = 7.5 g/ml (By putting the given values.) [ The ratio of the mass to volume is the density, that's why the unit of the density is also the ratio of the unit of mass to the unit of volume. ] Hence, the density of the object is 7
Explanation: Google
3.The melting point of lead is 327.5 °C. Which of the following statements is correct? (1 Point) A)Lead is a gas at 280 °C B)Lead is a solid at 310 °C C)Lead is a liquid at 300 °C D)Lead is a solid at 390 °C
Answer:
B)Lead is a solid at 310 °C
Explanation:
The melting point of a substance refers to that temperature in which the substance changes state from solid to liquid. The melting point of a substance, which is usually a temperature value, is that actual temperature the change of state occurs.
According to this question, the melting point of Lead (Pb), which is naturally a solid metal, is 327.5°C. This means that LEAD (Pb) will only change to its liquid state at exactly 327.5°C and above. Therefore, at a temperature of 310°C, which is lower than lead's melting point, Lead element will still be a solid.
Answer: The correct answer is B. Lead is a solid at 310
Explanation:
A block attached to a horizontal spring of force constant 75N/m undergoes SHM with an amplitude of 0.15m. If the speed of the mass is 1.7 m/s when the displacement is 0.12m from the equilibrium position, what is the mass of the block?
Answer:
x = A sin w t for SHM where w = angular frequency
sin w t = x / A = .12 / .15 = .8 where w t is the angle in degrees
w t = 53.1 deg (w itself is in rad / sec)
since v = A w cos w t
then v / x = w cos w t / sin w t = w / tan w t
w = v / x * tan 53.1 = 1.7 / .12 * tan 53.1 = 18.9 /sec
Also for SHM w = (k / m)^1/2
m = k / w^2 = 75 / 18.9^2 = .21 kg
Joseph drove for 3 hours at the speed of 40 km/h (kilometers per hour) . He changed his speed to 65 km/h for the next 2 hours. How far had Joseph driven in km?
Answer:
Two hundred fifty kilometer 250 km
Rita has two small containers, one holding a liquid and one holding a gas. Rita transfers the substances to two larger containers. Compare the behavior of the atoms in the liquid and in the gas once they are moved to the larger containers
Answer: liquids take the shape of the container they are in, but have definite volume. like liquids the shape of a gas changes with the container. unlike liquids the volume of a gas changes depending on the container it is in
Explanation:
Answer:
liquids flow freely, they take the shape of the container they are in, but have a definite volume. Like liquids, the shape of a gas changes with the container. This is because the atoms in a gas move rapidly and freely to fill any available space. Unlike liquids, the volume of a gas changes depending on the container it
Explanation
