Calculate the force of gravity between a human child
Calculate the force of gravity between a human child (mass = 28 kg) and the planet Mars (mass = 6.4 1023 kg), when Mars is at its closest to Earth (distance = 8. 1010 m).
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Bicyclists in the Tour de France do enormous amounts of work during a race. For example, the average power per kilogram generated by Lance Armstrong (m = 75.0 kg) is 6.50 W per kilogram of his body mass.
Find the time taken for the casting to slide down the plane a distance of 10 m without any external force being applied. Find also, the force required to give the casting an acceleration of 2 m/s2 up the plane.
A stream of water gets narrower as it falls from a faucet (try it and see). Explain this phenomenon using the equation of continuity.
Determine the normal reaction of the plane on the object and calculate the time taken for the object to reach the bottom of the plank and also its velocity at that time.
What tension in Newtons must a 50 cm length of string support in order to whirl an attached 2000 g stone in a circular path at 5 m/s?
If the ball was initially thrown from the street below, (a) what was its initial speed, (b) what altitude does it reach, (c) when does it reach the window, and (d) when does it reach the street again?
The mass of the second disk is 0.45 kg and its radius is 0.38 m. What is the angular velocity of the two disks combined?
A 55.0 kg pole vaulter running at 9.7 m/s vaults over the bar. If the vaulter's horizontal component of velocity over the bar is 1.0 m/s and air resistance is disregarded, how high was the jump?
(a) What is the velocity of the boat at t = 20.85 s? (b) Find the total displacement of the boat.
Two dogs pull horizontally on ropes attached to a post; the angle between the ropes is 55.0 degrees. Dog A exerts a force of 270 N and dog B exerts a force of 350 N. Find the magnitude of the resultant force.
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