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Get college assignment help at uniessay writers The collar A slides on a smooth horizontal bar. the spring constant k = 40 lb/ft. the weights are Wa = 30 lb and Wb = 60 lb. At the instant shown, the spring is unstretched and B is moving downward at 4 ft/s. Use conservation of energy to determine velocity of B when it has moved downward 2 ft from its current position.

PART C: What is the cyclotron frequency?

part c:What is the magnetic field strength that each wire produces at the location of the other?

The three ropes shown are tied to a small, very light ring that is stationary. Two of these ropes are anchored to walls at right angles with the tensions shown in the figure. What is the magnitude of the tension T3 in the third rope, if T1 = 37.7 N, T2 = 90.9 N, and the lengths of rope 1 and 2 are 1.96 m and 0.260 m, respectively?

A 151 kg car rounds a curve of radius 163 m at 46 m/s. The acceleration of gravity is 9.8 m/s2 . What force must the road exert on its tires to hold the car on course?

A fire engine moving to the right at 40 m/s sounds its horn (frequency 500 Hz) at the two vehicles shown in Figure 4. The car is moving to the right at 30 m/s, while the van is at rest. a) What frequency is heard by the passengers in the car ? b) What is the frequency as heard by the passengers in the van ? c) When the fire engine is 200 m from the car and 250 m from the van, the passengers in the car hear a sound intensity level of 90 dB. At that moment, what intensity level is heard by the passengers in the van ?

35. A force of 5.00 N to the left causes a 1.35 kg book to have a net acceleration of 0.76 m/s2 to the left. What is the frictional force acting on the book?

The potential energy of a particle moving along the x axis is given by U(x) = 8×2 2×4, where U is in joules and x is in meters. If the total mechanical energy is 9.0 J, the limits of motion are

The radius of curvature of a highway exit is r = 58.5 m. The surface of the exit road is horizontal, not banked. (See figure.) What is the minimum required value of the coefficient of static friction between the surface of the road and the tires so that the car can exit the highway safely without sliding at a constant speed of 64.1 km/h?

A 10.0-kg block of metal measuring 12.0 cm X 10.0 cm X 10.0 cm is suspended from a scale and immersed in water as in Figure P14.25b. The 12.0-cm dimension is vertical, and the top of the block is 5.00 cm below the surface of the water. (a) What are the forces acting on the top and on the bottom of the block? (Take P0 = 1.013 0 X 105 N/m2.) (b) What is the reading of the spring scale? (c) Show that the buoyant force equals the difference between the forces at the top and bottom of the block.

Get college assignment help at uniessay writers A 1900 kg car starts from rest and drives around a flat 59 meter diameter circular track. The forward force provided by the car’s drive wheels is a constant 1300 N.

a good baseball pitcher can throw a baseball toward home plate at 85 miles per hour with a spin of 1800 revolutions per minute. How many rotations does it make on a path of 60 feet?

A rifle bullet with a mass of 12.5 g traveling toward the right at 222 m/s strikes a large bag of sand and penetrates it to a depth of 21.3 cm. Determine the magnitude and direction of the friction force (assumed constant) that acts on the bullet.

A test rocket is launched by accelerating it along a 200.0-{rm m} incline at 1.57 {rm m/s^2} starting from rest at point A (the figure .) The incline rises at 35.0 ^circ above the horizontal, and at the instant the rocket leaves it, its engines turn off and it is subject only to gravity (air resistance can be ignored).

Suppose that 90 grams of hot water at a temperature of 75 degrees is poured into a cavity in a very large block of ice at 0 degrees. What mass of ice must melt in order for the water to cool down to the temperature found in Part (a)

How long, in seconds, does it take an automobile traveling 55.0 km/h to become even with a car that is traveling in another lane at 40.0 km/h if the cars’ front bumpers are initially 130 m apart?

A shopper in a supermarket pushes a loaded 31 kg cart with a horizontal force of 12 N. The acceleration of gravity is 9.81 m/s2 . a) Disregarding friction, how far will the cart move in 4.2 s, starting from rest? Answer in units of m.

Lead pellets, each of mass 1.20 g, are heated to 200°C. How many pellets must be added to 450 g of water that is initially at 20.0°C to make the equilibrium temperature 25.0°C? Neglect any energy transfer to or from the container.

A jet is circling an airport control tower at a distance of 21.0 km. An observer in the tower watches the jet cross in front of the moon. As seen from the tower, the moon subtends an angle of 8.88 10-3 radians. Find the distance traveled (in meters) by the jet as the observer watches the nose of the jet cross from one side of the moon to the other.

A 3.0-m-long rigid beam with a mass 150 {rm kg} is supported at each end. An 70 {rm kg} student stands 2.0 {rm m} from support 1. How much upward force does support 1 exert on the beam?

At time t=0 a grinding wheel has an angular velocity of 22.0 rad/s. It has a constant angular acceleration of 34.0 rad/s^2 until a circuit breaker trips at time t = 1.50 s. From then on, the wheel turns through an angle of 431 rad as it coasts to a stop at constant angular deceleration. At what time does the wheel stop?

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November 3, 2019