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A snowboarder of mass 86 kg travels down the slope of height 150 m shown in the figure below. If she starts from rest at the top and has a velocity of 14 m/s when she reaches the bottom, what is the work done on her by friction? Note: Figure not drawn to scale.
A forces of 16.88 N is applied tangentially to a wheel of radius 0.340 m and gives rise to an angular acceleration of 1.20 rad/s^2
a scientific instrument weighs 85.2 N in the Earth's surface and weighs 32.2 N in the surface of mercury. What is the acceleration of gravity on Mercury
In a photoelectric-effect experiment it is observed that no current flows unless the wavelength is less than 470 nm. What is the stopping voltage required if light of wavelength 410nm is used
What is velocity of the boat relative to the shore
Gamma rays are photons with very high energy. What is the wavelength of a gamma-ray photon with energy 605 keV
A plano convex lens is placed convex side down on a plane glass plate and illuminated from the above with red loght of wavelength of 625nm. what are the curvature and focal length of the convex surface of the lens
When a potential difference of 12V is applied to a wire 7.1m long and 0.34mm in diameter the result is an electric current of 2.2A. What is the resistivity of the wire
A helicopter flies over the arctic ice pack at a constant altitude, towing an airborne 117-kg laser sensor which measures the thickness of the ice, find the tension in the cable towing the sensor
A fisherman notices that his boat is moving up and down periodically, owing to waves on the surface of the water. How fast are the waves traveling
q1. a rock of mass m 1.0 kg is tied to a string of length l 1.9 m and is twirled in a vertical circle. the speed v of
A 70.0 kg football player leaps straight up into the air (with no horizontal velocity) to catch a pass. If the ball was moving horizontally when it was caught, how fast was the ball travelling
Assume 3 mol of neon (an ideal monatomic gas) at STP is compressed slowly and isothermally to 0.25 the original volume. The gas is then allowed to expand quickly and adiabatically back to its original volume.
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