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On an essentially frictionless, horizontal ice rink, a skater moving at 4.0 m/s encounters a rough patch that reduces her speed by 42% due to a friction force that is 22% of her weight. Use the work-energy theorem to find the length of this rough patch.
A 4.60 g bullet moving at 616 m/s strikes a 670 g wooden block at rest on a frictionless surface. The bullet emerges, traveling in the same direction with its speed reduced to 432 m/s. What is the speed of the bullet-block center of mass
a ball is shot from the ground into the air. at a height of 10.20 m the velocity is observed to be v 8.50 ms i 7.10
A sprinter running a 100 m dash leaves the starting block and accelerates to a maximum velocity of 11m/s at 6s into the race. What was the sprinter's average acceleration during the first 6s of the race
The intensity of a cylindrical laser beam is 0.800 W/m^2. The cross-sectional area of the beam is 3.0*10^-4*m^2, What is the average power output of the laser
an alpha particle the nucleus of a helium atom has a mass of 6.64 multiplied by 10-27 kg and a charge of 2e. what are
An electron and a proton are each placed at rest in an electric ?eld of 334 N/C. What is the velocity of the electron 46.2 ns after being released
You are called as an expert witness in the trial of a traffic violation. The facts are these: A driver slammed on his brakes and came to a stop with constant acceleration, How fast was he going when he hit his brakes
a laser positioned on a ship is used to communicate with a small two man research submarine resting on the bottom of a lake. How far is the submarine from the side of the ship
Power windmills turn in response to the force of high-speed drag. For a sphere moving through a fluid, the resistive force, FR is pro- portional to r2v2, where r is the radius of the sphere and v is the fluid speed.
A solid piece of aluminum "weighs" 57.6 g in air and 26.5 g when submerged in a liquid. (a) What is the volume of the metal piece? (b) What is the mass density of the liquid?
In a women's 100-m race, accelerating uniformly, Laura takes 1.87 s and Healan 3.12 s to attain their maximum speeds, find the maximum distance by which Healan is behind Laura
the outer surface of the grill hood shown is at 47 degrees celsius and the emissivity is 0.93. the heat transfer
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