PHYSICS HIGH SCHOOL

A 500 kg compact car and a 1500 kg truck are accelerated equally.which vehicle exerts more force?how many times more?(im guessing the 1500kg truck exerts more force but i don't know how to solve for how many times more)

Answers

Answer 1
Answer:
The truck doesn't "exert more force".

It TAKES more force to accelerate the truck at the same rate
as the car, because the truck has more mass.

Think: 
In order to move two rocks, you have to push harder on the heavy one
than you do on the lighter one.

How much more ?

In order to produce the same acceleration . . .

                    half as much mass  ===>  half as much force

                   twice as much mass ===> twice as much force

             ten times as much mass ===> ten times as much force

 a 1500-kg truck
     compared to
  a 500-kg car . . . triple the mass ===> triple the force, in order
                                                               to accelerate them equally .
                                                                    

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Calculate the average speed (in km/hr) of Charlie who runs to the store 4 km away in 30 mins

Answers

First of all . . .

-- You want to know "km / hr", so you know you'll have to divide distance by time.

-- You want "km / hr", so you know the time will have to be in hours.

     30 minutes = 1/2 hour

-- Doo da division:

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                   =    (4 over 1/2) (km/hr)

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Gravity is a force between any two objects with mass. Why doesn't a person feel a gravitational force between him/herself and another person?A) A person doesn't exert a gravitational force.

B) The two gravitational forces cancel each other out.

C) The gravitational forces of people is so small it is
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D) There are so many people we are actually balanced by all the different gravitational forces.

Answers

The answer would be C. The gravitational force between two bodies however it is too small that it is overshadowed by that of earth. Gravitational force is the weakest force of all. Each body with a mass exerts a gravitational force onto each other but this value is so small that it can be neglected.

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Answers

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Answers

Answer:

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Explanation:

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Choose the answer that explains the photoelectric effect.

Answers

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Answer:

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Explanation:

If an object moves in uniform circular motion in a circle of radius R = 1.0 meter, and the object takes 4.0 seconds to complete ten revolutions, calculate the centripetal acceleration.

Answers

Answer:

a_c=246.5 (m)/(s^2)

Explanation:

The formula for centripetal acceleration is:

a_c=rw^2

Where,

r: radius.

w:Angular speed.

Angular speed is defined by:

w=(\Delta\theta)/(\Delta t)

Where,

\theta: position angle.

t: time.

In this case we have that the object takes 4.0 seconds to complete ten revolutions.

You have to know that 1 revolution = 2\pi rad, then

10 revolutions= 10.2\pi rad = 20\pi rad

Replacing

\Delta\theta=20\pi rad\n\Delta t=4.0s

in the formula of Angular speed:

w=(\Delta\theta)/(\Delta t)\n\nw=(20\pi rad)/(4.0s)

w=5\pi (rad)/(s)\nw=15.7(rad)/(s)

Now we have,

a_c=rw^2\na_c=r(15.7(rad)/(s))^2

r=1.0m

a_c=1.0m(15.7(rad)/(s))^2\n\na_c=1.0(246.5)(m)/(s^2) \n\na_c=246.5(m)/(s^2)

Then the centripetal acceleration is:

a_c=246.5 (m)/(s^2)
a = ω²r

r = 1 m
ω = 2πf = 2π * 10 / 4 = π*5 s⁻¹
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