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if a 1500kg car is driven in sand at 5m/s, the coefficient of rolling friction is 0.06. In this case nearly all of the energy the car uses to move goes to overcoming rolling friction, so air drag can be ignored. What is the propulsion force need tot keep the car moving forward at a constant speed?
After the collision, the 0.177 kg puck has a speed of 1.38 m/s at an angle of 27? to the positive x axis. Examine the velocity of the 0.302 kg puck after the collision.
Two particles each have a mass of 7.00 10-3 kg. One has a charge of +5.0 10-6 C, and the other has a charge of -5.0 10-6 C. How fast is each particle moving when the separation between them is one-half its initial value
Two Hydrogen atoms, both with electrons in ground state, are brought close together. What is the angular momentum of an electron in a Hydrogen ground state
Capacitors won't hold a charge indefinitely; as time goes on, charge gradually migrates from the positive to the negative plate. What is the leakage resistance
the two stars in a binary star system have masses 1.7 x 10 ^ 30 kg and 5.8 x 10 ^ 30kg. They are separated by 2.1 x 10 ^ 12m, What is the speed of the heaviest star
A third listener is positioned along the positive y-axis. What is her y-coordinate if same wave front reaches her at the same instant it does the first two listeners.
A series RCL circuit contains a 30-mH inductor, 1.20-?F capacitor, and 150-? resistor. The rms voltage of the generator is 40.0 V and the generator has a frequency of 500 Hz. Determine the rms current in the circuit.
A dc motor is connected to a constant emf of 13.9 V. The resistance of its windings is 2.0 ?. What current does it draw at normal operating speed
A section of copper transmission line carries a steady current of 265A and has resistance 0.82 ohem, Ignoring the energy needed to refrigerate the superconductor, how much energy will be saved in one year
An aluminum cylinder is suspended in an unknown fluid by a spring scale. Outside the fluid, the object weighs 20N. In the fluid,
a man stands on the roof of a building of height 16.1m and throws a rock with a velocity of magnitude 26.8 m/s, Calculate the maximum height above the roof reached by the rock
Two runners start simultaneously from the same point on a circular 200-m track and run in the same direction. How far from the starting point will each have run at that instant
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