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A 16 kg girl slides down a playground slide that is 2.8 m high. When she reaches the bottom of the slide, her speed is 1.3 m/s.
(a) How much energy was dissipated by friction?
(b) If the slide is inclined at 20°, what is the coefficient of friction between the girl and the slide?
A ray of light strikes a mirror at an angle of 35.8° to the normal. What is the angle that the reflected angle makes with the normal
An underwater diver sees the sun 46 degrees above horizontal. How high is the sun above the horizon to a fisherman
A circular armature coil is used in a motor with a uniform magnetic field of 1.80 T. The coil has a diameter 95 cm, how much current is flowing throught the motor
A 50.0 g ball of copper has a net charge of 1.7 µC. What fraction of the copper's electrons have been removed
To find the height of an overhead power line, you throw a ball straight upward. The ball passes the line on the way up after 0.65, What is the height of the power line
Inductors in parallel. Two inductors L1 = 1.34 H and L2 = 2.20 H are connected in parallel and separated by a large distance so that the magnetic field of one cannot affect the other. Calculate the equivalent inductance
A tennis ball of mass = 0.068kg and speed = 21m/s strikes a wall at a 45 degree angle and rebounds with the same speed at 45 degrees. What is the magnitude of the impulse given to the ball
A wide beam of white light is incident normal to surface of oil film. An observer looking down at film sees green light that has maximum intensity at wavelength 5.2 x 10^-7m, Calculate speed at which light travels in film
A compound microscope has an objective lens of focal length 10.3 mm with an eyepiece of focal length 15.0 mm, What is the overall magnification of this microscope
A 0.344 kg mass is attached to a spring and undergoes simple harmonic motion with a period of 0.95 s. Find the amplitude of the motion
An object of mass 3m0 moves to the right at 0.8c. Calculate its momentum and energy
Suppose Fuzzy, a quantum-mechanical duck, lives in a world in which h = 2?J · s. Fuzzy has a mass of 2.25 kg, What is the minimum uncertainty in the duck's speed
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