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Get college assignment help at uniessay writers An 11.0 m, 280 N uniform ladder rests against a smooth wall. The coefficient of static friction between the ladder and the ground is 0.60, and the ladder makes a 50.0° angle with the ground. How far up the ladder can an 800 N person climb before the ladder begins to slip?

A golfball with an initial speed of 144 m/s lands exactly 190 m downrange on a level course. The acceleration of gravity is 9.8 m/s2 . Neglecting air friction, what minimum projection angle would achieve this result? What maximum pro- jection angle would achieve this result?

What is the tangential acceleration of a bug on the rim of a 5.0 in diameter disk if the disk accelerates uniformly from rest to an angular speed of 79 revolutions per minute in 3.0 s?

It continues to fly along the same horizontal arc but increases its speed at the rate of 1.05 m/s2. Find the magnitude of acceleration under these new conditions. Answer in units of m/s2.

A curve of radius 51.8 m is banked so that a car traveling with uniform speed 49 km/hr can round the curve without relying on fric- tion to keep it from slipping to its left or right. The acceleration of gravity is 9.8 m/s2 . What is θ? Answer in units of ◦.

A 150-rm V voltmeter has a resistance of 2.0×104 Omega. When connected in series with a large resistance R across a potential of 110 V, the meter reads 61 V.

The arm in the figure below weighs 43.0 N. The force of gravity acting on the arm acts through point A. Determine the magnitudes of the tension force t in the deltoid muscle and the force s of the shoulder on the humerus (upper-arm bone) to hold the arm in the position shown.

One billiard ball is shot east at 2.8 m/s. A second, identical billiard ball is shot west at 1.4 m/s. The balls have a glancing collision, not a head-on collision, deflecting the second ball by 90° and sending it north at 1.51 m/s. What are the speed and direction of the first ball after the collision?

A roller coaster, shown in Fig. 6-38 (h1 = 40 m, h2 = 12 m, h3 = 30 m), is pulled up to point A where it and its screaming occupants are released from rest. Assuming no friction, calculate the speed at points B, C and D. point B m/s point C m/s point D m/s

A 4.20 102 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing 9.70 104 J of work on the balloon in the process. At what height above the surface of the earth does the balloon have a speed of 7.30 m/s?

Get college assignment help at uniessay writers Oxygenated hemoglobin absorbs weakly in the red (hence its red color) and strongly in the near infrared, while deoxygenated hemoglobin has the opposite absorption. This fact is used in a “pulse oximeter” to measure oxygen saturation in arterial blood. The device clips onto the end of a person’s finger and has two light-emitting diodes [a red (680 nm) and an infrared (965 nm)] and a photocell that detects the amount of light transmitted through the finger at each wavelength. (a) Determine the frequency of each of these light sources. (b) If 66% of the energy of the red source is absorbed in the blood, by what factor does the amplitude of the electromagnetic wave change? [Hint: The intensity of the wave is equal to the average power per unit area as given by Equation 21.28 given below.] 3Your answer is incorrect.

An opaque cylindrical tank with an open top has a diameter of 3.10 m and is completely filled with water. When the afternoon Sun reaches an angle of 27.0° above the horizon, sunlight ceases to illuminate the bottom of the tank. How deep is the tank?

In the figure below, a uniform sphere of mass m = 1.05 kg and radius r = 3.4 cm is held in place by a massless rope attached to a frictionless wall a distance L = 9.0 cm above the center of the sphere. (a) What is the tension in the rope? 1 N (b) What is the force on the sphere from the wall? 2 N

Chromium is produced by reacting with its oxide with aluminum. If 76g of Cr2O3 and 27g of Al completely react to form 51g of Al2O3 how many grams of Cr are formed?

A projectile is fired straight upward at 118 m/s. How fast is it moving at the instant it reaches the top of its trajectory? Answer in units of m/s.

Two charges, one twice as large as the other, are located 15 cm apart and experience a repulsive force of 95 N. What is the magnitude of the larger charge?

A 2100 kg pile driver is used to drive a steel I-beam into the ground. The pile driver falls 7.00 m before coming into contact with the top of the beam, and it drives the beam 12.0 cm farther into the ground before coming to rest. Using energy considerations, calculate the average force the beam exerts on the pile driver while the pile driver is brought to rest.

A 2.3 kg ball strikes a wall with a velocity of 8.3 m/s to the left. The ball bounces off with a velocity of 7.1 m/s to the right. If the ball is in contact with the wall for 0.23 s, what is the constant force exerted on the ball by the wall?

In the figure below, a 55.0 kg uniform square sign, of edge L = 2.00 m, is hung from a horizontal rod of length dh = 3.00 m and negligible mass. A cable is attached to the end of the rod and to a point on the wall at distance dv = 4.00 m above the point where the rod is hinged to the wall.

The pulley system shown in the figure is used to lift a 65kg crate. Note that one chain connects the upper pulley to the ceiling and a second chain connects the lower pulley to the crate. The crate is rising with an acceleration of 3.4 m/s2 . Assuming the masses of the chains, pulleys, and ropes are negligible, determine the magnitude of the force and the tension in the upper chain. The tension in the lower chain is .859 kN

A 3.6 kg bucket of water is raised from a well by a rope. If the upward acceleration of the bucket is 3.8 m/s2, find the force exerted by the rope on the bucket of water.

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November 3, 2019