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A high-diver of mass 70 kg jumps off a board 10 meters above the water. If, 1 s after entering the water his downward motion is stopped, what average upward force did the water exert?. 100 N 245 N 490 N 980 N.

Transcripts

A high-jumper of mass 70 kg hops off a board 10 meters over the water. In the event that, 1 s subsequent to entering the water his descending movement is halted, what normal upward drive did the water apply? 100 N 245 N 490 N 980 N

A 10-gram slug is let go into a 200-gram piece of wood very still on a level surface. After effect, the piece slides 8 m before stopping. On the off chance that the coefficient of rubbing µ = 0.4, discover the velocity of the projectile before effect. 106 m/s 166 m/s 226 m/s 286 m/s

A baseball infielder, mass 75 kg, hops up with speed 3 m/s and gets a 0.15 kg baseball moving evenly at 50 m/s. What is the last energy of the framework, infielder and baseball? 225.125 kg-m/s 227.91 kg-m/s 230.03 kg-m/s 232.5 kg-m/s

A firehose coordinates a constant flow of 15 kg/sec of water with speed 28 m/s against a level plate. What power is required to hold the plate set up? 110 N 420 N 1100 N 4116 N

Popeye, of mass 70 kg, has quite recently brought down a container of spinach. He quickens rapidly and stops Bluto, of mass 700 kg (Bluto is extremely thick), who is charging in at 10 m/s. What was Popeye's speed? 10 m/s 31 m/s 50 m/s 100 m/s

How a long way from the focal point of the Earth is the focal point of mass of the Earth-moon framework? The moon has 1/81 the mass of the Earth and their middle to-focus partition is 384,000 km. 4,683 km 4,740 km 4,800 km 42,666 km

A substantial unit for force is which of the accompanying? kg-m/s kg-m/s 2 kg-m N-m

what might as well be called the amount drive as far as the principal amounts (mass, length, time) is which of the accompanying? MLT - 1 ML 2 T - 2 MLT - 2

A 75 kg swimmer jumps on a level plane off a 500 kg flatboat. On the off chance that the jumper's velocity instantly subsequent to leaving the pontoon is 4 m/s, what is the comparing flatboat speed? 0.2 m/s 0.5 m/s 0.6 m/s 4.0 m/s

A 75 kg swimmer plunges on a level plane off a 500 kg flatboat. The jumper's rate instantly in the wake of leaving the flatboat is 4 m/s. A miniaturized scale sensor framework joined to the edge of the flatboat measures the time interim amid which the jumper applies a drive to the pontoon only before leaving the flatboat surface. In the event that the time interim is perused as 0.2 s, what is the extent of the normal level power by jumper on the pontoon? 900 N 450 N 525 N 1500 N

During a snowball battle two balls with masses of 0.4 and 0.6 kg, separately, are tossed in such a way, to the point that they meet head-on and join to frame a solitary mass. The size of beginning speed for each is 15 m/s. What is the pace of the 1.0 kg mass promptly after impact? zero 3.0 m/s 6.0 m/s 9.0 m/s

Two skaters, both of mass 50 kg, are on skates on a frictionless ice lake. One skater tosses a 0.2 kg frisbee at 5 m/s to her companion, who gets it and tosses it back at 5 m/s. At the point when the principal skater has gotten the returned frisbee, what is the speed of each of the two skaters? 0.02 m/s, moving separated 0.04 m/s, moving separated 0.02 m/s, moving towards each other 0.04 m/s, moving towards each other

A 90-kg halfback running north with a velocity of 10 m/s is handled by a 120-kg rival running south at 4 m/s. The crash is inelastic. Register the speed of the two players soon after the tackle. 3 m/s south 2 m/s south 2 m/s north 3 m/s north

A neutron in an atomic reactor makes a versatile head-on crash with a carbon particle at first very still. (The mass of the carbon molecule is 12 times that of the neutron.) What division of the neutron's motor vitality is exchanged to the carbon particle? 14.4% 28.4% 41.4% 56.6%

At liftoff, the motors of the Saturn V rocket devoured 13,000 kg/s of fuel and depleted the burning items at 2900 m/s. What was the aggregate upward constrain (push) gave by the motors? 3.77 x 10 7 N 7.54 x 10 7 N 1.47 x 10 8 N 2.95 x 10 8 N

A 200 gm meter stick has two articles joined to it, one of 100 gm at the 30 cm mark and the other of 300 gm at the 70 cm mark. At what mark on the meter stick is the focal point of gravity of the framework? 38 cm 50 cm 57 cm 60 cm

A uniform extension range measures 50 x 10 3 N and is 40.0 m long. A vehicle measuring 15 x 10 3 N is stopped with its focal point of gravity found 12.0 m from the right dock. Where is the focal point of mass of the extension vehicle mix situated as measured from the left dock? 14 m 18 m 22 m 26 m

A player hits a tossed baseball with a bat, thumping the ball back in the bearing from which it arrived in an in part inelastic impact. The bat, which is heavier than the baseball, keeps on moving in the same course after the hit as the hitter "follows through." Is the ball moving speedier before or after it was hit? The ball was moving speedier before it was hit. The ball was moving quicker after it was hit. The ball was moving at basically the same rate previously, then after the fact the hit. There is inadequate data to answer this issue.

A 1.00 kg duck is flying overhead at 1.50 m/s when a seeker fires straight up. The 0.010 kg slug is moving 100 m/s when it hits the duck and stays stopped in the duck's body. What is the rate of the duck and projectile instantly after the hit? 1.49 m/s 2.48 m/s 1.80 m/s 1.78 m/s

A model rocket sits on the platform until its fuel is touched off, impacting the rocket upward. Amid the brief span of take off, as the lighted fuel goes down, the rocket goes up in light of the fact that the focal point of mass of rocket and touched off fuel stay basically stationary. the fuel pushes on the ground. air contact pushes on the getting away fuel. the descending power of gravity is not exactly the descending force of the fuel.

A billiard ball moving at 5 m/s strikes a stationary chunk of the same mass. After the crash, the first ball moves at a speed of 4.35 m/s at an edge of 30 ° as for its unique movement. Discover the speed and point of the ball that was struck after the impact. 1.25 m/s @ 30 ° 1.44 m/s @ 60 ° 2.16 m/s @ 30 ° 2.50 m/s @ 60 °

A 70 kg man is remaining in a 20 kg pontoon. The man ventures to the right supposing he is venturing out onto the dock. In any case, the accompanying will really happen (disregard the contact of the water or air on the watercraft or the man): The man just moves a short separation to one side while the pontoon moves a bigger separation to one side. The man really stays still while the watercraft moves toward the left. The pontoon doesn't move and the man moves to one side. none of these will happen.

In a halfway flexible crash between two items with unequal mass the speed of one will increment by the sum that the speed of alternate reductions. the energy of one will increment by the sum that the force of alternate abatements. the vitality of one increments by the sum that the vitality of different reductions. the aggregate force of the framework will diminish.

A 7-kg knocking down some pins ball strikes a 2-kg pin. The pin flies forward with a speed of 6 m/s, the ball proceeds forward at 4 m/s. What was the first speed of the ball? 4.0 m/s 5.7 m/s 6.6 m/s 3.3 m/s

If a glass of water is on a table with a bit of paper under it, it is moderately simple to haul the paper out without irritating the glass in particular if the force is done rapidly. This is on account of, with a brisk draw, the power on the glass will be less. the force of the paper will be more prominent. the ideal opportunity for the draw will be less. the coefficient of dynamic grating will be less.

Two billiard balls have speeds of 2.0 m/s and - 1.0 m/s when they meet in a flexible head-on impact. What is the last speed of the main ball after crash? - 2.0 m/s - 1.0 m/s - 0.5 m/s +1.0 m/s

A ball with unique force +4.0 kg-m/s hits a divider and bobs straight back without losing any dynamic vitality. The adjustment in energy of the ball is 0 - 4.0 kg-m/s 8.0 kg-m/s - 8.0 kg-m/s

Two items, one less huge than the other, impact and ricochet back after the crash. In the event that the two initially had speeds that were equivalent in size yet inverse in course, then after the crash which one will move quicker (the impact is in part inelastic)? The less monstrous one. The more gigantic one. The rates will be the same after the crash. There is no real way to be certain with inelastic impacts.

A moderate power will break an egg. Be that as it may, an egg dropped out and about normally breaks, while one dropped on the grass ordinarily doesn't break in light of the fact that for the egg dropped on the grass, the adjustment in energy is more noteworthy. the adjustment in energy is less. the time interim for halting is more noteworthy. the time interim for halting is less.

If the motor vitality of an article is quadrupled, its force will change by what variable? zero two eight four

A 0.10 kg object moving at first with a speed of +.20 m/s makes a versatile head-on impact with a 0.15 kg protest at first very still. What is the last speed of the 0.10 kg object after the crash? +0.16 m/s - 0.16 m/s +0.04 m/s - 0.045 m/s

A uranium core (mass 238 units) very still rots into a helium core (mass 4 units) and a thorium core (mass 234 units). On the off chance that the speed of the helium core is 6 x 10 5 m/s, what is the speed of the thorium core? 10,250 m/s 3.04 x 10 4 m/s 3.55 x 10 4 m/s 4.1 x 10 4 m/s

A 0.10 kg object moving at first with a speed of +.20 m/s makes a versatile head-on impact with a 0.15 kg question at first very still. What rate of the first active vitality is held by the 0.10 kg object? 5% - 4% half 96%

A helicopter stays on high by pushing extensive amounts of air descending each second. What mass of air must be pushed descending at 40 m/s consistently to keep a 1000 kg helicopter up high? 120 kg 245 kg 360 kg 490 kg .:tsl