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You are twirling a tennis ball on a string in the vertical direction at a constant speed. The radius of the circle is 1.20m and the mass of the ball is 0.200kg.
What is the slowest speed that keeps the ball traveling in a circle?
At this speed, what is the tension in the rope at the bottom of the swing?
A 0.60 nF parallel-plate capacitor has plate area A = 1.4×10?4 m. what is the plate separation
Mary observes damped oscillations of a glider on air track. she observed that the amplitude decreased to 30% of its original value after 12s
A steel cable with total length 20 m and mass 100 kg is connected to two poles. The tension in the cable is 2,000 N, and the wind makes the cable vibrate with a frequency of 2 Hz. compute the wavelength of the resulting wave on the cable.
An electric wire that has a mass of 5 kg for a 20m length is strung between two poles 20 m apart. What should be the tension in the wire if it is to take 0.8 seconds for a pulse to travel along the wire from one pole to the other.
An aluminum bar has a length of 2.0 m and transverse dimensions of 3.5 mm and 6.9 mm, What force is required to stretch the bar 1.2 mm
What least horsepower must a motor have to be able to drag a 320 box along a level floor at a speed of 1.10 if the coefficient of friction is 0.50.
A person with a digital camera uses a lens of focal length 15.0mm to take a photograph of the image of a 1.40cm -tall seedling located 9.80cm behind a double-convex lens of 17.0cm focal length
A girl is standing at the edge of the cliff 271 m above the ground. She reaches out over the edge of the cliff and throws a rock straight upward with a speed of 6.17 m/s. a) how long does it take the rock to hit ground? b) What is the speed of the ro..
A pen contains a spring with a spring constant of 251 N/m. How much work is done by the spring force to ready the pen for writing
A friend advised the owner of the bowl to keep it out of direct sunlight to avoid blinding the fish, which might swim into the focal point of the parallel rays from the sun. Is the focal point actually within the bowl
A piece of glass has a temperature of 85.8° C. Liquid that has a temperature of 43.0° C is poured over the glass, completely covering it, determine the specific heat capacity of the liquid
A speedboat moving at 38.0 m/s approaches a no-wake buoy marker 100 m ahead. What is the velocity of the boat when it reaches the buoy
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