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A man walks with constant speed of 2 m/s east for 30 s, then turns around and walks with constant speed 2 m/s for 10 s. Find her average acceleration for those 40 seconds?
a bullet is moving at a speed of 367 ms when it embeds into a lump of moist clay. the bullet penetrates for a distance
a hot air balloon decends toward the ground with a velocity of 1.6 ms. a champagne bottle is opened to celebrate
A semi truck is stopped across a road. As a driver approaches at 20 m/s he sounds the horn of his car (f=350 Hz). find the frequency of the horn heard by the truck driver
A one kilogram textbook drops from a one-meter high table in a room at 250C temperature. Find the change in entropy after the system has reached equilibrium
A grindstone of radius 4.0 m is initially spinning with an angular speed of 8.0 rad/s. What is the average angular speed of the Grindstone
A 30 g steel ball bounces elastically on a steel plate, always returning to the same maximum height h = 14.2 m. What is the weight of the ball
A canoe has a velocity of 0.37m/s southeast relative to the earth. The canoe is on a river that is flowing 0.47m/s, Find the magnitude of the velocity of the canoe relative to the river
A refrigerator uses an ideal Carnot cycle to cool its interior. The outside air has a temperature of 302 K and the refrigerator is kept at a temperature of 276 K. find the coefficient of performance of this refrigerator
A common problem inside orbiting space stations is monitoring astronauts weight, or better said mass. What is the mass of the astronaut
A compound microscope has a barrel whose length is 18.3 cm and an eyepiece whose focal length is 1.2 cm. What focal length must the objective have so the angular magnification of the microscope is -270
You are driving south on a highway at 25 m/s (approximately 55mi/h) in a snowstorm. When you last stopped, you noticed that the snow was coming down vertically, however it is passing the windows of the moving car at an angle of 37° to the horizontal...
a 6-kg bowling ball rooling at 5m/s strikesa stationary 4-kg bowling ball.if ball number one is moving forward at 2m/s after the collision, what is the impluse of the system
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