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Get college assignment help at uniessay writers A rock of mass 34 kg accidentally breaks loose from the edge of a cliff and falls straight down. The magnitude of the air resistance that opposes its downward motion is 248 N. What is the magnitude of the acceleration of the rock?

A rock of mass m = 2.0 kg is tied to a string of length L = 1.9 m and is twirled in a vertical circle as shown in the figure below. The speed v of the rock is constant; that is, it is the same at the top and the bottom of the circle. If the tension in the string is zero when the rock is at its highest point (so that the string just barely goes slack), what is the tension when the rock is at the bottom?

A 13 loudspeaker is suspended 3.0 below the ceiling by two cables that are each 40 from vertical. What is the tension in the cables?

A square steel plate is 10.0 on a side and 0.500 thick. Assume that the plate is oriented with the square faces horizontal to the ground. Find the shear strain that results if a force of magnitude 5.00×105 is applied to the top square face of the plate, parallel to the side, and a force of equal magnitude is applied in the opposite direction to the bottom face of the plate as shown .

Chapter 6, Problem 92 A circular curve of highway is designed for traffic moving at 97 km/h. Assume the traffic consists of cars without negative lift. (a) If the radius of the curve is 140 m, what is the correct angle of banking of the road? (b) If the curve were not banked, what would be the minimum coefficient of friction between tires and road that would keep traffic from skidding out of the turn when traveling at 97 km/h?

A loudspeaker of mass 17.0 {rm kg} is suspended a distance of h = 2.20 {rm m} below the ceiling by two cables that make equal angles with the ceiling. Each cable has a length of l = 3.70 {rm m}.

An 9.0 m, 200 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.55, and the ladder makes a 50.0° angle with the ground. How far up the ladder can an 760 N person climb before the ladder begins to slip?

When a 124 N bag of nails hangs motionless from a single vertical strand of rope, how much tension is exerted in the strand?

A toy car runs off the edge of a table that is h = 1.150 m high. The car lands d = 0.425 m from the base of the table. How fast was the car going on the table?

A 415 kg bear grasping a vertical tree slides down at constant velocity. What is the friction force that acts on the bear?

Get college assignment help at uniessay writers A child goes down a playground slide with an acceleration of 1.34 m/s2. Calculate the coefficient of kinetic friction between the child and the slide if the slide is inclined at an angle of 34.0° below the horizontal.

Some enterprising physics students working on a catapult decide to have a water balloon fight in the school hallway. The ceiling is of height 3.5 m, and the balloons are launched at a velocity of 10 m/s. The acceleration of gravity is 9.8 m/s2 . At what angle must they be launched to just graze the ceiling? Answer in units of ◦.

1. Eight books, each 4.9 cm thick with mass 1.2 kg, lie flat on a table. How much work is required to stack them one on top of another? 2. A 392 kg piano slides 3.5 m down a 25.8° 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 (between the piano and the ramp) is 0.43. A) Calculate the force exerted by the man. B) Calculate the work done by the man on the piano. C) Calculate the work done by the friction force. D) Calculate the work done by the force of gravity. E) Calculate the net work done on the piano. 3. A grocery cart with a mass of 17.6 kg is being pushed at constant speed along an aisle by the force Fp = 17 N which acts at an angle of 19.5° (down) from the horizontal. Find the work done by each of the forces (mg, FN, Fp, Ffric) on the cart if the aisle is 16.1 m long.

At the airport, you pull a 19 suitcase across the floor with a strap that is at an angle of 48 above the horizontal.

A baseball outfielder throws a 0.150 kg baseball at a speed of 44.0 m/s and an initial angle of 27.0°. What is the kinetic energy of the baseball at the highest point of its trajectory?

A 73.0 kg base runner begins his slide into second base when moving at a speed of 4 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 much mechanical energy is lost due to friction acting on the runner? How far does he slide?

A 5000 kg helicopter accelerates upward at 0.50 m/s2 while lifting a 2000 kg car. What is the lift force exerted by the air on the rotors? What is the tension in the cable that connects the car to the helicopter?

a car is traveling 20.0 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 7.0 m/s

LC circuit has a capacitor of capacitance C, initially charged by a battery of voltage V. It is discharged through an inductor of inductance L. Derive the formula for the oscillating current, I, in LC circuit as a function of time. Hints: 1) charge flowing in LC circuit, oscillates and is described by the following function: Q = Qmax*cos(wt). Maximum charge, Qmax, is defined by battery’s voltage and capacitance of capacitor: Qmax = C*V. 2) Current, I, in LC circuit is defined as delta Q / delta t. You have to substitute Q in current formula with the expression for Q from Hint 1. Then use Δ(cos ωt)/Δt = – ωsin(ωt) (derivative of cosine function is negative sine function times the angular frequency, ω).3) Frequency of EM oscillations in LC circuit is determined by natural frequency of LC circuit, ω. Use symbols: L for inductance, C for capacitance, v for battery’s voltage, t for time, sqrt for square root, / for division, * for multiplication, sin for sine function.

What is the magnitude of the apparent weight of a 79 kg astronaut 5100 km from the center of the Earth’s Moon in a space vehicle moving at constant velocity?

A car moving at 35 km/h skids 10 m with locked brakes. How far will the car skid with locked brakes at 105 km/h?

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November 3, 2019