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Problem: A sled of mass m=20kg is sliding down a slide. At the top of the slide it is given a speed v=4m/s. While sliding down it loses 300J of energy because of friction and it reaches the bottom having speed 7m/s.
Part A: What is the vertical height of the slide?
Please show how you obtained the vertical height of the slide.
A stationary motion detector sends sound waves of frequency0.135 MHz toward a truck approaching at a speed of 49.2 m/s. What is the frequency of the waves reflected back to the detector?
A speed skater moving across frictionless ice at 8.6 m/s hits a 5.5 m wide patch of rough ice. She slows steadily, What is her acceleration on the rough ice
The position of a 250g object is given (in meters) by x=5.0t^3 -8.0t^2 -44t , where t is in seconds. Determine the net rate of work done on this object
a ball of mass 20 kg moves with a velocity of 2 ms along the x axis call it ball a. it collides with a ball of mass 12
The half life for the alpha decay of uranium 238 is 4.47x10^9 yrs old. Determine the age (in years) of the rock specimen that contains 60% of its original number of Uranium 238 atoms.
A torque of 60 Nm producing a counterclockwise rotation is applied to the wheel about its axle. A frictional torque of 10 nm acts at the axle.If the wheel is observed to accelerate at the rate of 2rad/s2 under the influence of these torques, what i..
a football is punted with an initial velocity of 26.1 ms and an initial angle of 53.1o. what is its hang time the time
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The acceleration of a motorcycle is given by 0.,(1) = AI -B1 2, where A = 1.50 m/s3 and B = 0.120 m/ s4 The motorcycle is at rest at the origin at time I = O. (a) Find its position and velocity as functions of time. (b) Calculate the maximum velocity..
A dropped rubber ball hits the floor with a speed of 8.0 m/s and rebounds to a height of 0.25 meter. Find what fraction of the initial kinetic energy was lost in the collision
A boat takes 3.30 hours to travel 40.0 km down a river, then 5.00 hours to return. How fast is the river flowing
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