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Get college assignment help at uniessay writers What is the acceleration of two falling sky divers (mass 104.0 kg including parachute) when the upward force of air resistance is equal to one-fourth of their weight?

A ball of mass 9.0 kg is suspended by two wires

A ball of mass 9.0 kg is suspended by two wires from a horizontal arm, which is attached to a vertical shaft, as shown in Fig. 5.12. The shaft is in uniform rotation about its axis such that the linear speed of the ball equals 2.8 m/s. The rotation is halted and the system is at rest. The tensions T1 and T2 in wires 1 and 2 are closest to:

what is an acrostic poem for kinetic energy

what is an acrostic poem for kinetic energy

A baseball is thrown at an angle of 28 degrees relative

A baseball is thrown at an angle of 28 degrees relative to the ground at a speed of 25.6m/s. The ball is caught 55.3841m from the thrower. The acceleration due to gravity is 9.81m/s square. How long is it in the air ?

Question 1 2 points Save A heat pump . . .

Question 1 2 points Save A heat pump . . . moves heat from a cooler reservoir to a warmer reservoir. requires work to be supplied by an external source. Both A and B. Neither A nor B. Question 2 2 points Save Which of the following statements is another way of describing the second law of thermodynamics? No engine is 100% efficient. Energy is always conserved. Energy is transferred from less energetic atoms to those with more energy. All available energy can be used to do work. Question 3 2 points Save Internal energy of a heat engine . . . does not change. may increase but will never decrease. may decrease but will never increase. is the same at the end of a full cycle as it was at the beginning. Question 4 2 points Save The most effective engine possible is . . . one that is 100 percent effective. one which produces no waste heat. one which operates at maximum efficiency possible given intake and release temperatures. one which works fastest. Question 5 2 points Save An irreversible heat transfer is one which loses energy from a system to its surroundings in a process that maintains constant entropy in the system. True False

A superhero flies 156 m from the top of a tall

A superhero flies 156 m from the top of a tall building at an angle of 35 ◦ below the horizontal. What is the vertical component of the super- hero’s displacement?

A superhero flies 277 m from the top of a tall

A superhero flies 277 m from the top of a tall building at an angle of 26 degrees below the horizontal. What is the horizontal component of the superhero’s displacement?

A charge of 1 Coulomb is place at the 0- cm

A charge of 1 Coulomb is place at the 0- cm mark of a meter stick. A charge of −1 Coulomb is placed at the 100-cm mark of the same meter stick. Is it possible to place a proton somewhere on the meter stick so that the net force on it due to the two charges is 0? 1. No 2. Yes; to the right of the 50-cm mark 3. Yes; to the left of the 50-cm mark

A carbon resistor is to be used as a thermometer. On

A carbon resistor is to be used as a thermometer. On a winter day when the temperature is 4.00, the resistance of the carbon resistor is 217.4 . What is the temperature on a spring day when the resistance is 215.8

On a very muddy football field, a 120 kg linebacker tackles

On a very muddy football field, a 120 kg linebacker tackles an 75 kg halfback. Immediately before the collision, the linebacker is slipping with a velocity of 8.6 m/s north and the halfback is sliding with a velocity of 7.4 m/s east. What is the magnitude of the velocity at which the two players move together immediately after the collision?

A 67.0 kg base runner begins his slide into second base

Get college assignment help at uniessay writers A 67.0 kg base runner begins his slide into second base when moving at a speed of 3.7 m/s. The coefficient of friction between his clothes and Earth is 0.70. He slides so that his speed is zero just as he reaches the base. How far does he slide?

If a person can jump a horizontal distance of 3.7 m

If a person can jump a horizontal distance of 3.7 m on Earth, how far could the person jump on the moon, where the free-fall acceleration is g/6 and g = 9.81 m/s2? .. in meters How far could the person jump on Mars, where the acceleration due to gravity is 0.38 g? in meters

An archer shoots an arrow horizontally at a target 15 m

An archer shoots an arrow horizontally at a target 15 m away. The arrow is aimed directly at the center of the target, but it hits 60 cm lower. What was the initial speed of the arrow? (Neglect air resistance.)

Rope BCA passes through a pulley at point C and supports

Rope BCA passes through a pulley at point C and supports a crate at point A. Rope segment CD supports the pulley and is attached to an eye anchor embedded in a wall. Rope segment BC creates an angle of = 57.0 with the floor and rope segment CD creates an angle with the horizontal. If both ropes BCA and CD can support a maximum tensile force = 160 , what is the maximum weight of the crate that the system can support? What is the angle required for equilibrium

A football is thrown upward at a(n) 37◦ angle to the

A football is thrown upward at a(n) 37◦ angle to the horizontal. The acceleration of gravity is 9.8 m/s2 . To throw a(n) 57.8 m pass, what must be the initial speed of the ball?

A spot of paint on a bicycle tire moves in a

A spot of paint on a bicycle tire moves in a circular path of radius 0.33 {rm m}. When the spot has traveled a linear distance of 1.70 m, through what angle has the tire rotated? Give your answer in radians.

Two friends, Al and Jo, have a combined mass of 190

Two friends, Al and Jo, have a combined mass of 190 kg. At the ice skating rink, they stand close together on skates, at rest and facing each other. Using their arms, they push on each other for 1 second and move off in opposite directions. Al moves off with a speed of 8.6 m/sec in one direction and Jo moves off with a speed of 9.3 m/sec in the other. You can assume friction is negligible.

A student bikes to school by traveling first = 0.800 miles

A student bikes to school by traveling first = 0.800 miles north, then = 0.600 miles west, and finally = 0.200 miles south. If a bird were to start out from the origin (where the student starts) and fly directly (in a straight line) to the school, what distance would the bird cover? Express your answer in miles.

A man pushes horizontally on a desk that rests on a

A man pushes horizontally on a desk that rests on a rough wooden floor. The coefficient of static friction between the desk and floor is 0.750 and the coefficient of kinetic friction is 0.600. The desk’s mass is 100 kg. He pushes just hard enough to get the desk moving and continues pushing with that force for 5.00 s. How much work does he do on the desk?

A delivery truck travels 32 blocks north, 16 blocks east, and

A delivery truck travels 32 blocks north, 16 blocks east, and 26 blocks south. Assume the blocks are equal length. What is the magnitude of its final displacement from the origin? Express your answer using two significant figures. What is the direction of its final displacement from the origin? Express your answer using two significant figures.

Sam, whose mass is 60 kg, takes off across level snow

Sam, whose mass is 60 kg, takes off across level snow on his jet-powered skis. The skis have a thrust of 280 N and a coefficient of kinetic friction on snow of 0.15. Unfortunately, the skis run out of fuel after only 15 s.

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