An elevator motor lifts 715 kg of mass to the height of the fourth floor of an office
building (11.0 meters above ground level)
at a constant speed in 9.35 seconds.
Determine the power rating of the motor.
A 841.17 Watts
B 1573 Watts
C5955.95 Watts
D 8243.5 Watts

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.

The space between two 15-in.-long concentric cylinders is filled with glycerin (viscosity = 8.5 × 10-3 lb·s/ft2). the inner cylinder has a radius of 1 in. and the gap width between cylinders is 0.1 in. determine (a) the torque and (b) the power required to rotate the inner cylinder at 180 rev/min. the outer cylinder is fixed. assume the velocity distribution in the gap to be linear.

Which planets are visible without a telescope