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A motorcycle and a police car are moving in the same direction, with the motorcycle in the lead. The police car emits sound with a frequency of 502 Hz and has a speed of 26.5 m/s. The motorcycle has a speed of 13.0 m/s.
What frequency does the motorcyclist hear in this case?
A variable-speed drill, initially turning at 300 rpm, speeds up to 1300 rpm in a time interval of 0.3 s
An air-track glider is attached to a spring. The glider is pulled to the right and released from rest at t=0 s. What is the amplitude of the oscillation
In a period of 1.0 s, 5.0 x10^23 nitrogen molecules strike a wall of area 7.80 cm2. If the molecules move at 270 m/s and strike wall head on in a perfectly elastic collision, find the pressure exerted on the wall. (The mass of one N2 molecule is 4..
One of the first signs of sunburn is the reddening of the skin (called erythema). How many photons are incident on the skin in this amount of exposure
An AC generator supplies an rms voltage of 220 V at 50.0 Hz. It is connected in series with a 0.600 H inductor, a 5.10 ?F capacitor, What is the average power dissipated in the circuit
A baseball has a mass of 0.15 kg and radius 3.7 cm. In a baseball game, determine the rotational and translational kinetic energies of the ball
Assume 3.0 moles of a diatomic gas has an internal energy of 10 kJ. Determine the temperature of the gas after it has reached equilibrium.
A cosmic-ray proton in interstellar space has an energy of 10 MeV and executes a circular orbit having a radius equal to that of Mercury's orbit around Sun (5.80 × 1010 m). What is the magnetic field in that region of space.
23g of copper pellets are removed from a 300?C oven and immediately dropped into 70mL of water at 23?C in an insulated cup
Under some circumstances, a star can collapse into an extremely dense object made mostly of neutrons and called a neutron star. If the original star rotated once in 35 days, find the angular speed of the neutron star
Consider an athlete who jumps a horizontal distance of 9m after reaching a maximum height of 1.5m. What was the takeoff speed v0 of the athlete
A ball of mass 0.200 kg has a velocity of ; a ball of mass 0.300 kg has a velocity of . They meet in a head-on elastic collision. Proof that the collision was elastic
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