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A bat moving at 7.2 m/s is chasing a flying insect. The bat emits a 43 kHz chirp and receives back an echo at 43.68 kHz. At what speed is the bat gaining on its prey? Take the speed of sound in air to be 336 m/s. Answer in units of m/s.
A student standing on the ground throws a ball straight up. How long is the ball in the air before it hits the ground
A 2180kg satellite used in a cellular telephone network is in a circular orbit at a height of 750km above the surface of the earth. What is the gravitational force on the satellit
The drawing shows a person (weight W = 582 N, L1 = 0.841 m, L2 = 0.406 m) doing push-ups. Find the normal force exerted by the floor on each hand
What is the speed of an electron with a de Broglie wavelength of 0.140nm and 0.140nm
A 150. W lamp is placed into a 120. V AC outlet. What are the peak and rms currents and What is the resistance of the lamp
An experimental bicycle wheel is placed on a test stand so that it is free to turn on its axle. What is the torque supplied by friction
A bus was initially traveling with a velocity of 50 km/hr east. Later it was observed traveling with a velocity of 100 km/h north. What was the change in velocity of the bus
What is the strength of the electric field.
Two space walkers, one with a mass of 77 kg and the other with a mass of 78 kg, hold on to the ends of a lightweight cable 14.5 m long. how far will the less massive astronaut move
a uniform disk with radius r = 10.0 cm and mass 650 g attached to a uniform rod with length L = 640 mm and mass 300 g. Calculate the rotational inertia of the pendulum about the pivot point
An object is placed 100 cm in front of a lens of focal length 20 cm. A second lens is placed 35 cm beyond the first, what is the height of the final image
A piece of Nichrome wire passes a current of 0.813 A when a potential of 1.44 Volts is applied. What is the resistance of the wire
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