Master Physics with Fun Quizzes & Brain Teasers!

A hockey puck on a frozen pond is given an initial speed of 20.0 m/s. If the puck always remains on the ice and slides 115 m before coming to rest, determine the coefficient of kinetic friction between the puck and ice.
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A 0.140-kg baseball is thrown with a velocity of 27.1 m/s. It is struck by the bat with an average force of 5000 N, which results in a velocity of 37.0 m/s in the opposite direction from the original velocity. How long were the bat and ball in contact?
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Hydrogen/hydronium ion concentration
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Calculate the volume of the part of the sphere that will be immersed in the mercury when the density of the sphere is 7800kg/metre cubic and volume of 136centrimetre cubic and the density of the mercury is 13600kg/metre cubic
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Animal studies indicate that
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A proton of mass m is at rest when it is suddenly struck head-on by an alpha particle (which consistsof 2 protons and 2 neutrons) moving at speed v. If the collision is perfectly elastic, what speed will the alpha particle have after the collision
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At least how many Calories does a mountain climber need in order to climb from sea level to the top of a 5.42 km tall peak assuming the muscles of the climber can convert chemical energy to mechanical energy with an efficiency of 16.0 percent. The total mass of the climber and the equipment is 78.4 kg. (Enter your answer as a number without units.)
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A rock falls from a vertical cliff that is 4.0 m tall and experiences no significant air resistance as it falls. At what speed will its gravitational potential energy (relative to the base of the cliff) be equal to its kinetic energy
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While looking out the window, you see lightning flash and then two seconds later, you hear the thunder. How far was the lightening from you
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Water flowing out of a horizontal pipe emerges through a nozzle. The radius of the pipe is 1.8 cm, and the radius of the nozzle is 0.53 cm. The speed of the water in the pipe is 0.75 m/s. Treat the water as an ideal fluid, and determine the absolute pressure of the water in the pipe.
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While the decibel scale can be used in many disciplines, we shall restrict our attention to its use in acoustics, specifically its use in measuring the intensity level of sound. The Sound Intensity Level (measured in decibels) of a sound intensity (measured in watts per square meter) is given by Compute Damage to your hearing can start with short term exposure to sound levels around 115 decibels. What intensity is needed to produce this level
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A lens of focal length 25.0 cm forms an image 37.5 cm from the lens. What was the object distance?
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Stars which never disappear below the horizon are called__stars. A. Polaris B. visible C. constellation D. circumpolar
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A ray diagram is shown what does the letter x represent?
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Which three terms are needed to describe the energy a BASE jumper has as she falls toward the ground?
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Which three terms are needed to describe the energy a BASE jumper has asshe falls toward the ground?O A. PotentialB. ElectromagneticC. GravitationalD. Kinetic
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A mass m on a spring with a spring constant k is in simple harmonic motion with a period T. If the same mass is hung from a spring with a spring constant of 3k, the period of the motion will be _______.
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A tall cylinder contains 30 cm of water. Oil is carefully poured into the cylinder, where it floats on top of the water, until the total liquid depth is 40 cm. Part A What is the gauge pressure at the bottom of the cylinder
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A 8.2 kg ball moving with a velocity of 14.6 m/s collides with a 3.3 kg ball moving with a velocity of 4.3 m/s in the opposite direction. Find the common velocity of the balls (in m/s) if they coalesce on impact. (Enter the magnitude only)
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A 100-gram wire that is 1.0 m long is under tension. When a transverse wave of frequency 800 Hz travels down the wire, its wavelength is 0.10 m and its amplitude is 6.5 mm. What is the tension in the wire?
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To obtain the same resistance force, a greater force must be exerted in a machine of lower efficiency than in a machineof higher efficiencyTrueFalse
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A lens of focal length 15.0 cmforms an image 77.5 cm from thelens. What was the objectdistance?(Unit = cm)
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An ideal transformer has LaTeX: N_1 = 1000 N 1 = 1000 (number of windings on the primary side), and LaTeX: N_2 = 8000 N 2 = 8000 (number of windings on the secondary side). If the rms voltage on the primary side is LaTeX: V_{rms}=100V V r m s = 100 V , what is the rms voltage on the secondary side? Give your answer in terms of Volts (rms), without entering the units.
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What is the velocity of an object that has been in free fall for 2.5
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