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Q. A reconnaissance plane flies 600 km away from its base at 240 km/h, then flies back to its base at 320 km/h. What is its average speed?
Q. Suppose the Sun were somehow replaced by a star with twice as much mass. What would happen to the gravitational force between Earth and the Sun?
A 120-g mug at 21C is filled with 210g of coffee at 91C. suppose all of the heat lost by the coffee is transferred to the mug, what is the final temperature of the coffee? The specific heat capacity of the mug is 7.8 X 10^2 J/(Kg C)
Two boats start together and race across a 56-km-wide lake and back. Boat A goes across at 52 km/h and returns at 56 km/h. Boat B goes across at 36 km/h, and its crew, realizing how far behind it is getting, returns at 79 km/h. Turnaround times are n..
An initially stationary 2.0 kg object accelerates horizontally and uniformly to a speed of 20 m/s in 1.9 s. (a) In that 1.9 s interval, how much work is completed on the object by the force accelerating it.
Two point charges, +3.09 µC and -6.05 µC, are separated by 1.33 m. What is the electric potential midway between them?
Compute coefficient of kinetic friction
With the battery disconnected the compass needle points to the right, in the plane of the coil. The apparatus is located near equator, where the Earth's magnetic field B Earth is horizontal, with a magnitude of 4×10-5 tesla. (Presume that B Earth ..
A mass of 1.61kg stretches a vertical spring 0.31m. If the spring is stretched an additional 0.132m and released, how long does it take to reach (new) equilibrium position again.
Two 10 cm-diameter charged thin rings face each other, 20 cm apart. The left ring is charged to 20 nC and the right ring is charged to +20 nC. What is the electric field.
A flight attendant pulls hero 70 N flight bag a distance of 253 m along a level airport floor at a constant velocity. The force she exerts is 40N at an angle of 52.0 degrees above the horizontal.
A spring with spring constant 12.5 hangs from the ceiling. A 400 ball is attached to the spring and allowed to come to rest. It is then pulled down 6.80 and released. What is the time constant if the ball's amplitude has decreased to 3.90 after 57.0 ..
What is the potential difference measured by voltmeter
What are the first, second, and third frequencies audible from a 20cm long organ pipe when (1) only one end is open and when (2) both ends are open. The speed of sound through the air inside the organ pipe is 343 m/s. (Hint: if a harmonic does not..
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