A group of students is standing on the floor of an elevator. Compare the reading on the scale to their true weight if. (i) the elevator accelerating downward, (ii) the elevator is at rest. a) Zero b) Equal to the normal force c) Equal to their true weight d) Less than their true weight e) Greater than their true weight 2)A helicopter with a mass of 810 kg, starting from rest, accelerates straight up from the roof of a hospital. A lifting force does work in raising the helicopter. (i) What two types of energy are changing? (ii) The helicopter rises from rest to a speed of 7.0 ms^1 in a time of 3.5 s. During this time it climbs to s height of 8.2 m. What is the average power generates by the lifting force? a) 5.6 x 10^3 W
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1) A group of students is standing on the floor of an elevator. Compare the reading on the scale to their true weight if. (i) the elevator accelerating downward, (ii) the elevator is at rest.
a) Zero
b) Equal to the normal force
c) Equal to their true weight
d) Less than their true weight
e) Greater than their true weight
2)A helicopter with a mass of 810 kg, starting from rest, accelerates straight up from the roof of a hospital. A lifting force does work in raising the helicopter. (i) What two types of energy are changing? (ii) The helicopter rises from rest to a speed of 7.0 ms^1 in a time of 3.5 s. During this time it climbs to s height of 8.2 m. What is the average power generates by the lifting force?
a) 5.6 x 10^3 W
b) 1.9 x 10^4 W
c) 2.4 x 10^4 W
d) Kinetic energy and gravitational potential energy
e) Electrical energy and gravitational potential energy
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