7513

Physics Force & Laws Of Motion Level: Misc Level

A cat drops from a tree limb to the ground in a perfect vacuum and is observed to reach the ground in 24.2 seconds. Upon impact, the cat comes to rest without bouncing in .123 seconds.

a.Determine the velocity of the cat just prior to impact w/the ground.

b.Determine the height of the limb.

c.Determine the average acceleration of the cat during the impact(or collison).

d.Using your result from part C, determine the average jerk experienced by the cat during the collision with the ground.


7479

Physics Force & Laws Of Motion Level: Misc Level

Two people pull on a stubborn mule. (a) the single force that is equivalent to the two forces shown, and (b) the force that a third person would have to exert on the mule to make the net force equal to zero.


7459

Physics Force & Laws Of Motion Level: Misc Level

Two ice skaters stand at rest in the center of an ice rink. when they push off against one another the 45 kg skater acquires a speed of 0.72 m/s. If the speed of the other skater is 0.84 m/s, what is this skater,s mass?kg


7458

Physics Force & Laws Of Motion Level: Misc Level

[Walker2 9.p.009.]In a typical golf swing, the club is in contact with the ball for about 0.0012 s.If the 45 g ball acquires a speed of 0.73 m/s,estimate the magnitude of the force exerted by the club on the ball.kN


7427

Physics Force & Laws Of Motion Level: Misc Level

Sand from a stationary hopper falls on a mov-ing conveyor belt at the rate of 4.94 kg/s. The belt is supported by frictionless rollers and moves at 0.726 m/s un-der the action of a horizontal external force supplied by the motor that drives the belt.Find the frictional force exerted by the belt on the sand. Answer in units of N.


7425

Physics Force & Laws Of Motion Level: Misc Level

A rocket engine consumes 100 kg of fuel per second. If the exhaust speed is 4000 m/s, calculate the thrust on the roket. Answer in units of kN.


7420

Physics Force & Laws Of Motion Level: Misc Level

A machine gun fires 20.9 g bullets at a speed of 322 m/ s.The gun fires 306 bullets/min. What is the average force the shooter must exert to keep the gun from moving? Answer in units of N.


7419

Physics Force & Laws Of Motion Level: Misc Level

A (n) 696 N man stands in the middle of a frozen pond of radius 10.4 m. He is un- able to get to the other side because of a lack of friction between his shoes and the ice.To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore, at a speed of 5.5 m/s. The acceleration of gravity is 9.81 m/s squared. How long does it take him to reach the south shore?Answer in units of s.


7417

Physics Force & Laws Of Motion Level: Misc Level

You want to enlarge a skating surface so you stand on the ice at one end and aim a hose horizontally to spray water on the schoolyard pavement. Water leves the hose at 3. 9 kg/s with a speed 19. 8 m/s. If your mass is 81 kg, what is your recoil acceleration? Neglect friction and the mass of the hose. Answer in units of m/s squared.


7406

Physics Force & Laws Of Motion Level: Misc Level

A hanging sign which weighs 50 N is pished out from the wall by a bracket, and supported by a rope tied to the wall.The rope makes an angle of 30 degrees with the wall. Find the force of tention in the rope.


7384

Physics Force & Laws Of Motion Level: Misc Level

When jumping straight down, you can be seriously injuredif you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact.A 75 kg man just before contact with the ground has a speed of 6.8 m/s.

a) In a stiff- legged landing he comes to a halt in 1.8 ms. Find the average net force that acts on him during this time.

b)When he bends his knees, he comes to a halt in 0.14 s.Find the average force now.

c)During the landing, the force of the ground on the man points upward, while the force due to gravity points downward.The average net force acting on the man includes both of these force. Taking into account the directions of these forces, find the force of the ground on the man in parts (a) and (b).


7378

Physics Force & Laws Of Motion Level: Misc Level

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of +18.0 m/s, while the exiting water stream has a velocity of -18.0 m/s. The mass of water per second that strikes the blade is 19.0 kg/s. Find the magnitude of the average force exerted on the water by the blade.


7377

Physics Force & Laws Of Motion Level: Misc Level

A 2.9 kg rectangular air mattress is 2.46 m long, 0.511 m wide, and 0.172 m thick. What mass can it support in water before sinking? Answer in units of kg.


7376

Physics Force & Laws Of Motion Level: Misc Level

Find the pressure exerted on the floor when the bed rests in its normal position. Assume that the entire lower surface of the bed makes contact with the floor.Answer in units of Pa.


7375

Physics Force & Laws Of Motion Level: Misc Level

A water bed is 3.47 m on each vertical side and 31.9 cm high.The acceleration of gravity is 9.8 m/s^2. The density of water is 1000 kg/m3. Find its weight.Answer in units of N.


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