10 questions
A student turns on flashlight. What is the energy conservation that happen there?
chemical - light - electrical
electrical - chemical - light
chemical - electrical - light
light - chemical - electrical
A person boils water by using electrical stove. What type of energy conservation there?
heat - electrical
electrical - heat
sound - heat
heat - light
A box is pushed by 20 N force to the right and displace for 0.1 m. What is the work done?
0.005 J
0.1 J
1 J
2 J
What is the formula of work?
W = F / d
W = F + d
W = F x d
W = F - d
A car has speed 5 m/s and the mass of the car 1000 kg. What is the kinetic energy of the car?
12500 J
25000 J
5000 J
2500 J
A box is raised from 2 m to 5 m. This box has mass 15 kg. What is the change in potential energy from initial to final point? (
)300 J
450 J
750 J
1000 J
Which of the following variable is not affect the potential energy?
height from ground
gravitational acceleration
mass
temperature
Potential energy of a feather is 2 J. The mass of the feather is 50 gram. What is the height of feather above the ground? (
)4 cm
40 cm
400 cm
4 km
Initially, the box at rest. Then after applied by a force, it moves to 10 m/s. The mass of box is 5 kg. What is the work done of force?
25 J
250 J
500 J
750 J
A marble is thrown upward with initial speed 20 m/s. The mass of marble is 0.01 kg. What is the maximum height reached by marble? (
)5 m
10 m
15 m
20 m