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Three resistors are connected to a battery as shown in the figure. R1=[R1] Ω, R2=10 Ω, and R3=20 Ω. If the power dissipated in resistor R2 is 40 W, how much power is dissipated in resistor R1 (in W)?

A weight with a mass of 23 kg is attached to a rope that is wound around a cylinder with a radius of 0.050 m at the top of a well. Find the torque the mass produces on the cylinder? (g = 9.81 m/s2.)

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Part of an electric circuit is shown in the figure. The known resistances are R1 = [R1] Ω and R2 = 15 Ω. The currents in the circuit are i = 2.0 A and i1 = 0.8 A, as indicated. What is the value of the resistance R3 (in Ω)?

A swimmer dives horizontally off a 500 kg raft. If the diver’s mass is 75 kg and his speed while leaving the raft is 4 m/s, what is the raft speed?

A fighter jet of mass 9600 kg is moving at a speed of 72 m/s. If its total energy is 2.60×108 J, how high from the ground is it?

A delivery truck is carrying a 120-kg refrigerator. The refrigerator is 2.20 m tall and 85.0 cm wide. The refrigerator is facing sideways and is prevented from sliding. What is the maximum acceleration that the truck can have before the refrigerator begins to tip over? Assume that the center of gravity of the refrigerator is located at its geometrical center.

Impulse is ___________.

If no forces are acting on a moving object, the object will continue to move with constant:

Which of the following is true about momentum? I. It is a vector. II. It is a product of mass times velocity. III. Impulses are required to change it.