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Get college assignment help at uniessay writers Heat capacity of copper is .092 calories per gram per degree Celsius. Show that the amount of heat needed to raise the temp of a 10-gram piece of copper from 0 degree Celsius to 100 degree Celsius is 92calories. How does that compare with the heat needed to reaise the temp of the same mass of water through the same temp difference?

Two long, parallel conductors carry currents I1 = 4.00 A and I2 = 4.00 A, both directed into the plane of the computer screen as shown in the figure. Determine the magnitude and direction of the resultant magnetic field at P.

A crate of books on a truck with the help of some planks sloping up at 35 degrees. The mass of the crate is 110kg, and the coefficient of sliding frictions between it and the planks is 0.7 . You and your friends push horizontally with a force F. Once the crate has started to move, how large must F be in order to keep the crate moving at a constant speed?

A speedboat starts from rest and accelerates at 2.01 m/s2 for 7.40 s. At the end of this time, the boat continues for an additional 5.90 s with an acceleration of 0.518 m/s2. Following this, the boat accelerates at -1.49 m/s2 for 8.05 s. (a) What is the velocity of the boat at t = 21.35 s? m/s (b) Find the total displacement of the boat.

A car with bad shock absorbers bounces up and down with a period of 0.736 s after hitting a bump. The car has a mass of 1340 kg and is supported by four springs of equal force constant k. Determine a value for k. Answer in units of N/m.

A 60 kg person escapes from a burning building by jumping from a window 20 m above a catching net. Assuming that air resistance exerts a 95 N force on the person during the fall, determine the person’s velocity just before hitting the net.

Two plane mirrors are facing each other. They are parallel, 1 cm apart, and 19 cm in length, as the drawing indicates. A laser beam is directed at the top mirror from the left edge of the bottom mirror. What is the smallest angle of incidence with respect to the top mirror, such that the laser beam hits the mirrors in each way?

An airtight box has a removable lid of area 1.00 10-2 m2 and negligible weight. The box is taken up a mountain where the air pressure outside the box is 8.00 104 Pa. The inside of the box is completely evacuated. What is the magnitude of the force required to pull the lid off the box?

A steel band exerts a horizontal force of 87.0 N on a tooth at point B. What is the torque on the root of the tooth about point A?

A 35 g bullet moving at 475m/s strikes a 2.5kg wooden block. The bullet passes through the block, leaving at 275m/s. The block was at rest when it was hit. How fast is it moving when the bullet leaves?

Get college assignment help at uniessay writers A 52 kg pole vaulter running at 14 m/s vaults over the bar. Her speed when she is above the bar is 1.3 m/s. Neglect air resistance, as well as any energy absorbed by the pole, and determine her altitude as she crosses the bar.

A 340 kg piano slides 3.5 m down a 28 degree incline and is kept from accelerating by a man who is pushing back on it parallel to the incline. The effective coefficient of kinetic friction is 0.34.

A cannonball launched with an initial velocity of 151 m/s at an angle of 50° follows a parabolic path and hits a balloon at the top of its trajectory. Neglecting air resistance, how fast is it going when it hits the balloon?

A long wire stretches along the x axis and carries a 4.0 {rm A} current to the right left( x right). The wire is in a uniform magnetic field {bf{vec B}} = left( 0.22{bf i} -0.39{bf j} 0.25{bf k} right),{rm T}. Determine the {rm x}-component of the force on the wire per {rm cm} of length.

A 65 kg human sprinter can accelerate from rest to 12 m/s in 2.9 s. During the same interval, a 34 kg greyhound can accelerate from rest to 23 m/s. Compute (a) the change in kinetic energy and (b) the average power output for each.

In the deep ocean, a water wave with wavelength 95 {rm m} travels at 12 {rm m}/{rm s}. Suppose a small boat is at the crest of this wave, 1.5 {rm m} above the equilibrium position. What will the vertical position of the boat be 5 seconds later?

What are the advantages and disadvantages of using the conservation of mechanical energy rather than Newton’s laws to solve problems?

Assume: Down the plane is the positive direc- tion and up the plane is the negative direction. A block of mass 310 kg slides on a friction- less plane inclined at 21◦ with the horizontal under the influence of a restraining force of 1138 N acting parallel to the incline and up the incline. The acceleration of gravity is 9.8 m/s2 . What is the magnitude of the acceleration k~ak of the block? Answer in units of m/s2.

a car is traveling 17.0 m/s when the driver sees a child standing on the road. She takes .80 s to react, then steps on the brakes and slows at 6.5 m/s squared. How far does the car go before it stops?

A 26.5 kg block is connected to an empty 1.00 kg bucket by a cord running over a frictionless pulley (Fig. 4-57). The coefficient of static friction between the table and the block is 0.500 and the coefficient of kinetic friction between the table and the block is 0.320. Sand is gradually added to the bucket until the system just begins to move. calculate acceleration of the motion.

A 523 kg bear grasping a vertical tree slides down at constant velocity. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on the bear? Answer in units of N. A 29 kg chair initially at rest on a horizontal floor requires a 365 N horizontal force to set it in motion. Once the chair is in motion, a 325 N horizontal force keeps it moving at a constant velocity. The acceleration of gravity is 9.81 m/s2 . a) What is the coefficient of static friction between the chair and the floor? b) What is the coefficient of kinetic friction between the chair and the floor?

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November 3, 2019