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A 0.14 kg sphere hangs on a string from the ceiling of a car that is accelerating horizontally at a constant rate. The sting makes an angle of 22o with the vertical. To a person sitting inside the car, the sphere appears motionless. (the angle between the sphere and the vertical is constant)
1) What is the tension in the string?
2) What is the magnitude of the net force on the sphere?
3) What is the magnitude of the acceleration of the car?
A dog running in the +y-direction at 7.0 m/s hears its owner call from behind, Compute the dog's change in velocity
A spaceship is measured to be 120 m long while it is at rest with respect to an observer. If the spaceship now flies past the observer with a speed of .99c, what length would the observer measure of the spaceship.
The plates of a 631-pF parallel plate capacitor are separated by 1.21 mm, what is the magnitude of the electric field in the capacitor
The mirrors used in a particular type of laser are 99.99% reflecting. What is the force due to radiation pressure on one of the mirrors
A 5000 kg helicopter accelerates upward at 0.50 m/s2 while lifting a 2000 kg car. What is the lift force exerted by the air on the rotors? Evaluate the tension in the cable that connects the car to the helicopter?
Kelli weighs 417 N, and she is sitting on a playground swing that hangs 0.44 m above the ground. Her mom pulls the swing back and releases it when the seat is 1.00 m above the ground. Imagine that air resistance is negligible.
Three charges are to be placed as follows: q1: 10.00 µC at (0.00,0.00) q2: -25.00 µC at (4.00,0.00) and q3: -2.00 µC at (0.00,-3.00), Calculate the electric potential energy of the group of three charges
The volume control on a surround-sound amplifier is adjusted so the sound intensity level at the listening position increases from 23 to 61 dB
A student has built a 20-cm-long pinhole camera for a science fair project. She wants to photograph the Washington Monument, How far should she stand from the Washington Monument
Standing at a crosswalk, you hear a frequency of 500 Hz from a siren of an approaching ambulance. Determine the ambulance's speed from these observations
A photon of wavelength 0.45000nm strikes a free electron that is initially at rest, What is the speed of the recoil electron after the collision
The minimum-wavelength X-ray produced by a certain X-ray tube is 0.283 nm. Find the minimum voltage applied to the tube
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