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A 310 W fan uses a motor to spin the 3.6 kg blades up to a speed of 19 m/s in 2.8 s using this electrical input, what is the efficiency of the motor?
A 12 kg block slides down the entire length of a 2.3 m long ramp with a coefficient of kinetic friction of 0.37. The work done by friction on the block is 94 J. What is the angle of inclination of the ramp?
A small electrical motor inside a toy truck moves 4 wheels each 0.10 kg at a speed of 1.1 m/s for 1.5 s. What is the power put out by the motor?
It takes 4500 J to raise the temperature of 2.3 kg of a liquid. If the specific heat capacity of the liquid is 3900 J/kg°C, what is the change in temperature of the liquid?
A 10 kg block is pushed 20.0 m up the sloping surface of a plane inclined at an angle of 37o to the horizontal by a constant force F of 110.0 N acting parallel to the plane as shown in figure 2 below. The coefficient of kinetic friction between the block and plane is 0.25.
Two large parallel plates are placed horizontally with respect to each other and are then connected to a 100-V battery. If the distance between the plates is 1 cm, the uniform electric field between the plates is 104 N/C in the upward direction as shown by the vectors in the figure. If the electron is released from rest at the upper plate, calculate: i. kinetic energy of the electron after traveling 1 cm to the lower plate
surface on which it rest is 0.29.The system is in equilibrium. Calculate the maximum mass for object B
for which the system will remain in equilibrium.
