PHYSICS EXAM

Question 1

For an object travelling with uniform circular motion, its acceleration is: ?

Answer 1

Constant

Question 2

If an Arrows mass id doubled and speed is halved, the momentum is changed by a factor of: ?

Answer 2

One (Nothing Happens to the Momentum)

Question 3

The electric field, between two point charges is mathematically similar to what property of two masses?

Answer 3

Force of Gravity

Question 4

Electric field between two parallel plates is: ?

Answer 4

the same throughout the field

Question 5

What are some of the properties of light ( EM Waves)?

Answer 5

Refraction, Reflection

Question 6

According to modern physics theories, time is: ?

Answer 6

relative to observers

Question 7

what is the area under a (V vs T) curve represent?

Answer 7

Distance

Question 8

What is the area under a (A vs T) curve represent

Answer 8

Velocity

Question 9

Explain why it can be said that all orbiting satellites are constantly in free fall?

Answer 9

the force of the centripical acceleration conceals the force of gravity

Question 10

Describe on difference and one similarity between totally elastic collisions and totally inelastic collisions

Answer 10

Same: Both collisions have the same momentum before and after the collision.

Differnece: totally elastic collisions don’t lose any kinetic energy

Question 11

Explain why the speed of light is the same for light coming out of a flash light on a moving train as it for the person holding one on the ground using Einstein solution to newtons failure

Answer 11

The speed of light is a constant

c

Question 12

state the law of conservation of momentum

Answer 12

the momentum going in equals the momentum coming out

Question 13

Explain the centripetal acceleration and centripetal force is . shows the formula and describe the variable of the equation.

Answer 13

centripetal acceleration: the rate of change in tangent velocity

centripetal force: net force causing the centripetal acceleration of an object in circular motion

ac = v^2/r

fac = mac

Question 14

Explain gravitation force.

show the formula

Answer 14

gravitation force is the force from gravity acting on an object

fg = ma

Question 15

What is the difference between synchronous orbit & ordinary orbit?

Answer 15

Synchronous orbit: when an object is orbiting at the same speed of the planet spinning

Ordinary Orbit: when an object orbits the earth at any speed

Question 16

What is artificial gravity and how is it created?

Answer 16

Artificial gravity is when gravity is simulated using ac

it is created when a space craft has a rotating room that has a high enough velocity to create an ac equal to earths