Question

Which of the following is an example of work being done on an object?
A.
A box rests on the floor.
B.
Water in a pot changes into steam.
C.
A man pushes a couch across the room.
D.
A prism scatters ultraviolet light into visible light.

Answer 1

Katey is bowling. She starts with the ball in her right hand and her arm as far back as it will go. She swings the ball forward, applying a force of 51 Newtons the whole time. When her hand has traveled through a path of 0.9 meters, she releases the ball, and it rolls down the lane.

How much work is involved in this example?
A.
0 N⋅m
B.
45.9 N⋅m
C.
123 N⋅m
D.
Andy pushes a desk across the floor.

Answer 2

i need help on both of them.

Answer 3

#Mehek14

Answer 4

Which of the following is the correct definition of chemical energy?
A.
energy of an object due to the random motion of its atoms and molecules
B.
energy produced from the splitting of atoms
C.
energy an object has because of its motion or position
D.
energy stored in chemical bonds of molecules

Answer 5

Erica uses a door knob to open a door. A door knob is an example of a wheel and axle. The knob of the door is the wheel and the shaft is the axle. As Erica turns the knob, the shaft is also turned, and the door opens.

The knob of a door always has a larger radius than the shaft so that the distance over which the force is applied _______ in order to _______ the effort force needed to open the door.
A.
decreases; increase
B.
increases; increase
C.
decreases; decrease
D.
increases; decrease

Answer 6

Natural disasters impact wildlife as well as people. What natural disaster would be most likely to carry away plants and animals and bury habitats under soil?
A.
an earthquake
B.
a volcanic eruption
C.
a forest fire
D.
a landslide