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Get college assignment help at uniessay writers A 1000 kg car with a speed of 80 km/h brakes to a stop. How many calories of heat are generated by the brakes as a result?

A 10,000-kg freight car moving at 2 m/s runs into a 5000-kg freight car at rest. They couple upon collision and move away as one body at…

a 130 g block on a frictionless table is firmly attached to one end of a spring with k=26 N/m. The other end of the spring is anchored to the wall. a 26 g ball is thrown horizontally toward the block with a speed of 5.6 m/s. if the collision is perfectly elastic, what is the ball’s speed immediately after the collision? what is the maximum compression of the spring?

A grocery cart with a mass of 13 kg is being pushed at a constant speed up a flat 16 degree ramp by a force Fp which acts at an angle of 17 degrees below the horizontal. Find the work done by the: (a) gravitational force, (b) normal force, and (c) Fp on the cart if the ramp is 15 m long.

charged particle(m=6 g,q=-10×10-6 q)moves in a region of uniform field along a helical path (radius = 2.0 cm, pitch = 7.0 cm) as shown. What is the angle between the velocity of the particle and the magnetic field?

comment on the relative magnitudes of the resistances of an ammeter and voltmeter

when the galvanometer in a wheatstone bridge circuit shows no deflection, why are the voltages across opposite branches on each side of the galvanometer necessarily equal?

for a slide-wire wheatstone bridge, why should the sliding key not be moved with the key depressed?

An athlete at the gym holds a 1.2 kg steel ball in his hand. His arm is 64 cm long and has a mass of 4.0 kg. What is the magnitude of the torque about his shoulder if he holds his arm straight, but 30 degrees below horizontal?

A 130-{rm kg} crate, starting from rest, is pulled across a floor with a constant horizontal force of 410 N. For the first 13 m the floor is frictionless, and for the next 13 m the coefficient of friction is 0.25.

Get college assignment help at uniessay writers Determine how many calories of heat must be removed to change 100g of vapor at 240°C to solid at 20°C. Consider the following properties of the substance: heat of fusion 300 cal/g, heat of vaporization 600 cal/g, specific heat capacity as a liquid -0.75 cal/g-Co, melting point at 20°C and boiling point of 240°C.

A loudspeaker of mass 25.0 kg is suspended a distance of h = 1.00 m below the ceiling by two cables that makeequal angles with the ceiling. Each cable has a length of l = 2.90 m. What is the tension T in each of the cables? Use 9.80 m/s2 for the magnitude of theacceleration due to gravity.

A 1.7-kg block is released from rest and allowed to slide down a frictionless surface and into a spring. The far end of the spring is attached to a wall, as shown. The initial height of the block is 0.36 m above the lowest part of the slide and the spring constant is 480 N/m.What is the block’s speed when it is at a height of 0.25 m above the base of the slide? m/s (b) How far is the spring compressed? m (c) The spring sends the block back to the left. How high does the block rise? m

A 55 kg ice skater, initially at rest on a flat skating rink, requires a 198 N horizontal force to be set in motion. However, after the skater is in motion, a horizontal force of 175 N keeps her moving at a constant velocity. Find the coefficients of static and kinetic friction between the skates and the ice

An engine falls off an airplane at a speed of 280m/s and an altitude of 4500m. What is the horizontal distance the engine will travel before it hits the ground?

a person whose eyes are 1.7m above the floor stands in front of a plane mirror. The top of her head is 0.12m above her eyes. What is the height of the shortest mirror in which she can see her entire image? How far above the floor should the bottom edge of the mirror be placed?

Find the magnitude and direction of the resultant force, given the vertical component of a force vector is 580 N and the horizontal component is 200 N.

A space traveler weighs 750 N on earth. What will the traveler weigh on another planet whose radius is three times that of the earth and whose mass is twice that of the earth.

The driver of an 2000 kg car traveling at 20.0 m/s slams on the brakes, locking the wheels on the dry pavement. The coefficient of kinetic friction between rubber and dry concrete is typically 0.650. a) Use the work-energy theorem to calculate how far the car will travel before stopping. b) How far would the car travel if it were going twice as fast? c) What happened to the car’s original kinetic energy?

A 20.0 kg bag of dirt falls 10.0 m at a construction site. Assuming that all of the heat produced is retained by the dirt, how much will its temperature increase? (cdirt = 0.20 cal/deg-gm)

A 250 gram sample of a metal is warmed from 60 °C to 85 °C when 1000 cal are added. What is the specific heat constant for the metal?

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November 3, 2019