Question

1) Work is a transfer of (1 point)
energy
force
mass
motion
2) a small 20-kilogram canoe is floation downriver at a speed of 2m/s. what is the canoes kinetic energy? (1 point)
22J
40J
80J
400J
4) which of the following is an example of an object with elastic potential energy?(1 point)
a wind-up toy that has been wound up
a compressed basketball
a stretched rubber band
all of the above
5) the energy stored in gasoline is (1 point)
chemical energy
electromagnetic energy
mechanical energy
nuclear energy

Answer 1

6) what is the formula for gravitational potential energy? (1 point)
KE=1/2mv^2
PE=KE
PE=mgh
1.2mv^2=mgh
7) Energy which travels through space in the form of waves is known as (1point)
electrical energy
electromagnetic energy
nuclear energy
thermal ennergy

Answer 2

Will give a medal for best answer!!!!!!

Answer 3

1. A When a force is applied to an object while the object moves with some aligned component, work is done on the object.
2. B, 40J
Ek=1/2m(v)^2 <-- formula Ek= Kinetic Energy!
Ek=1/2(20kg)( 2m/s)^2.
Ek=1/2(20kg)(4m^2/s2)
= .5*20gk*4m^2/s^2
4. D, All of the above

Answer 4

5. A, Chemical energy
6. C, PE=mgh
7. B, Electromagnetic energy

Answer 5

THANK YOU!!!!!!