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A spacecraft is in orbit around a planet. The radius of the orbit is 2.9 times the radius of the planet (which is R = 71547 km). The gravitational field at the surface of the planet is 21 N/kg. What is the period of the spacecraft's orbit? [Hint: You don't need any more data about the planet to solve the problem.]
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 12-g nail
Two soccer players start from rest, 43 m apart. They run directly toward each other, both players accelerating. How much time passes before the players collide
In a skating stunt known as crack-the-whip, a number of skaters hold hands and form a straight line. obtain the magnitude of the centripetal force
Two uniform solid cylinders, each rotating about its central (longitudinal) axis, have the same mass of 1.25 kg, What is the rotational kinetic energy of the smaller cylinder
A 125 kg flatbottomed boat is floating along at 5.0 m/s, headed east. Sally Sue, standing at one end of the boat, starts to walk at 2.0 m/s, what is the speed of the boat as she walks along
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
A 140 g, 90.0 mph fastball comes across the plate very nearly horizontally and is batted at 90.0 mph at a 30.0 degree angle (above the horizontal) toward center field. Determine the impulse (in N's) acting on the ball
A constant force is applied to an object, causing the object to accelerate at 6 m/s^2?, What will the acceleration be if the force is halved
When UV light of wavelength 245nm falls on a metal surface, What is the work function of the metal
A straight rod of length L = 22.2 cm, carries a uniform charge, ? = 3.00 × 10-6 C/m, What is the magnitude of the electric field at yP = 50.0 cm
A spherical raindrop of mass 0.0112 g and radius 1.39 mm falls from a cloud that is at a height of 1195 m above the ground. What is the raindrop's terminal speed
An RL circuit has a 5 kO resistor and a 1 mH inductor. This circuit is driven by a 100 Hz sine wave with 1 V amplitude. What is the amplitude of the current in the circuit
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