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Get college assignment help at uniessay writers I’m not sure where to start…A car traveling at 25 m/s, downhill for 200 m, reaches a speed of 50 m/s. The weight of the car is 2500 lbs. The angle between the slope of the hill and the horizontal is 10o. (a) What is the force of friction between the wheels of the car and the ground? (b) What is the normal force between the wheels of the car and the ground?

A spring is hung from the ceiling. A 0.550 kg block is then attached to the free end of the spring. When released from rest, the block drops 0.130 m before momentarily coming to rest.

A 340 piano slides 3.8 down a 32 incline and is kept from accelerating by a man who is pushing back on it parallel to the incline (see the figure ). The effective coefficient of kinetic friction is 0.40.

A bat flies toward a wall, emitting a steady sound of frequency 2.00kHz . This bat hears its own sound plus the sound reflected by the wall.How fast should the bat fly in order to hear a beat frequency of 10.0Hz ?

Lillian (mass 50.0 kg) standing on slippery ice catches her leaping dog (mass 15 kg) moving horizontally at 2.0 m/s. What is the speed of Lilian and her dog after the catch?

Switch S has been closed for a long time, and the electric circuit shown in the figure below carries a constant current. Take C1 = 3.00 µF, C2 = 6.00 µF, R1 = 4.00 k, and R2 = 7.00 k. The power delivered to R2 is 2.10 W.Find the charge on C1

Two long, parallel conductors carry currents I1 = 1.50 A and I2 = 2.50 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.

At t = 0 a grinding wheel has an angular velocity of 31.0 . It has a constant angular acceleration of 28.0 until a circuit breaker trips at 1.50 . From then on it turns through 352 as it coasts to a stop at constant acceleration. (There are several ways to do this question, and there is no preferred order in which to do A, B and C.) A)At what time (measured from t = 0) did the grinding wheel stop? B)What was the angular acceleration of the grinding wheel as it slowed down? C)Through what total angle did the wheel turn between t = 0 and the time it stopped?

A 16.0 kg sled is being pulled across a horizontal surface at a constant velocity. The pulling force has a magnitude of 81.5 N and is directed at an angle of 30.0° above the horizontal. Determine the coefficient of kinetic friction.

A hard-boiled egg of mass 51.0 moves on the end of a spring with force constant 24.5 . Its initial displacement is 0.303 . A damping force acts on the egg, and the amplitude of the motion decreases to 0.101 in a time of 5.00 Calculate the magnitude of the damping constant b.

Get college assignment help at uniessay writers The pulley system shown in the figure is used to lift a 39 kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. Assume that the masses of the chains, pulleys, and ropes are negligible and the crate is rising with an acceleration of 2.6 m/s2.

A sled of mass is being pulled horizontally by a constant horizontal force of magnitude . The coefficient of kinetic friction is . During time interval , the sled moves a distance , starting from rest.

A rectangular block of ice 6 m on each side and 0.8 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3.

A rectangular block of ice 7 m on each side and 1.1 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. How many penguins of mass 24 kg each can stand on the ice block before they get their feet wet?

A rectangular block of ice 14 m on each side and 0.8 m thick floats in sea water. The density of the sea water is 1025 kg/m3. The density of ice is 917 kg/m3. How high does the top of the ice block float above the water level?

ercury is poured into a tall glass. Ethyl alcohol (which does not mix with mercury) is then poured on top of the mercury until the height of the ethyl alcohol itself is 129 cm. The air pressure at the top of the ethyl alcohol is one atmosphere. What is the absolute pressure at a point that is 9.82 cm below the ethyl alcohol-mercury interface?

A 28.0 {rm kg} block is connected to an empty 1.80 {rm kg} bucket by a cord running over a frictionless pulley. The coefficient of static friction between the table and the block is 0.48 and the coefficient of kinetic friction between the table and the block is 0.30. Sand is gradually added to the bucket until the system just begins to move .

3. Two objects of masses m and 3m are moving toward each other along the x-axis with same initial speed v0. The object with mass m is traveling to the left, and the object with mass 3m is traveling to the right. They undergo an elastic glancing collision such that m is moving downward after the collision at right angles from its initial direction. (a) Find the final speeds of the two objects. (b) What is the angle at which the object with mass 3m is scattered?

Ball A, of mass 3.0 kg, is attached to a 0.4-m light rod, freely pivoted at P. Ball B is suspended from Q by a 0.6-m rope and is at rest. Ball A is raised to a certain level and is released. Ball A descends, and has a speed v1 = 3.6 m/s at the bottom, prior to striking ball B. The speed of balls A and B after the collision are v2 = 1.1 m/s and v3 = 2.3 m/s, as shown. In Fig. 8.6 attached, the mass of ball B is? Please provide step-by-step method.

You throw a snowball at an angle of 30.0° below the horizontal from the roof of a building that is 95.0 m above flat ground. The snowball hits the ground a distance of 45.0 m from the base of the building. Assume free fall with up as positive, and use g = 9.80 m/s2. (a) How long does the projectile remain in the air? (b) What is the initial speed of the snowball?

A 25.5 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 0.455 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 the acceleration of the system.

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November 3, 2019