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A tennis ball of mass 57 g travels with velocity < 68, 0, 0 > m/s toward a wall. After bouncing off the wall, the tennis ball is observed to be traveling with velocity < -62, 0, 0 > m/s
Moon effect. Some people believe that the Moon controls their activities. The Moon moves from being directly on the opposite side of Earth from you to be being directly overhead. Assume that the Ear
A step-up transformer has 300 turns on its primary coil and 90,000 turns on its secondary coil. If the current flowing through the secondary is .5 amps. What is the current flowing in the primary?
A force vector points at an angle of 77° above the +x axis. It has a y component of 281 newtons. Find the magnitude of the force vector.
A dog sits 3.0 m from the center of a merry-go-round. What is the angular speed of the merry-go-round?
What is the maximum speed with which a 1050- car can round a turn of radius 77 on a flat road if the coefficient of static friction between tires and road is 0.90?
A Federation starship (2.0 106 kg) uses its tractor beam to pull a shuttlecraft (4.0 104 kg ) aboard from a distance of 20 km away. The tractor beam exerts a constant force of 4.0 104 N on the shutt
What is the free-fall acceleration on a planet where the period of a 1.06 m long pendulum is 2.72 s?
A baseball player pitches a fastball toward home plate at a speed of 43 m/s. The batter swings, connects with the ball of mass 143 g, and hits it so that the ball leaves the bat with a speed of 38 m
A flight attendant pulls her 73 N flight bag a distance of 220 m along a level airport floor at a constant velocity. The force she exerts is 41 N at an angle of 58° above the horizontal. What i
A model rocket is launched straight upward with an initial speed of 30.0 m/s. It accelerates with a constant upward acceleration of 2.50 m/s2 until its engines stop at an altitude of 170 m. (a) Wha
What is a good thesis statement for a persuasive essay about hobbies and you think that basketball is the best hobby to take up.
A uniform electric field of magnitude 325 V/m is directed in the negative y direction as shown (Fig. P25.4). The coordinates of point A are (-0.200, -0.300) m and those of point B are (0.400, 0.500
In a performance test, each of two cars takes 8.6 s to accelerate from rest to 24 m/s. Car A has a mass of 1288 kg, and car B has a mass of 1805 kg. Find the net average force that acts on (a) car
A net torque of magnitude 500 N m is exerted on the rotor of an electric generator for 25 s. What is the magnitude of the angular momentum of the rotor at the end of 25 s if it was initially at rest?
What phase difference between two identical traveling waves, moving in the same direction along a stretched string, results in the combined wave having an amplitude 1.50 times that of the common amp
Sally travels by car from one city to another. She drives for 26.0 min at 81.0 km/h, 47.0 min at 48.0 km/h, and 16.0 min at 30.0 km/h, and she spends 5.0 min eating lunch and buying gas. Determine
Calculate the wavelength associated with a man (mass 70 kg)running with a volicity of 5m-1 and an electron (mass 9.1*10-31 kg)travilling with a volicity of 1ms-1 would you expect to see the wave -li
Why is carbon dating unable to provide accurate estimates of very old materials?
If the train is accelerating at on a level track, what is the tension in the coupling between the second and third cars? The car nearest the locomotive is counted as the first.
Find the work she does on the flight bag. Find the work done by the force of friction on the flight bag. Find the coefficient of kinetic friction between the flight bag and the floor.
A bowling ball (mass = 7.9 kg, radius = 0.11 m) and a billiard ball (mass = 0.39 kg, radius = 0.028 m) may each be treated as uniform spheres. What is the magnitude of the maximum gravitational for
Which of Galileo's initial observations was most challenging to established geocentric beliefs?
A string under a tension of 68 N is used to whirl a rock in a horizontal circle of radius 3.4 m at a speed of 30.12 m/s. The string is pulled in, and the speed of the rock increases. When the string
Two small spheres spaced 20.0 centimeters apart have equal charge.How many excess electrons must be present on each sphere if the magnitude of the force of repulsion between them is newtons?