Other Physics Answers

A pitcher hurls a 0.25kg softball. The ball starts from rest and leave the pitcher's hand at a speed of 25m/s. How much work is done on the softball by the hurler's arm? Show complete solution.

A 0.075kg arrow is fire horizontally. The bowstring exerts an average force of 65N on the arrow over a distance of 0.09m. With what speed did the arrow leave on bow. Show complete solution.

A work skier whose mass is 70kg has an initial speed of 6m/s. Later the speed of the skier is becomes 11m/s. Determine the work done by the net force acting on the skier. Show complete solution.

Solve for the specific gravity

1. Coconut oil has density of 930kg/ m³

2. Sea water has a density of 1025 kg/m³

1. A 0.45-caliber bullet with m = 0.133 kg hurled from a gun’s muzzle at 950 m/s.

2. A 0.126-lb tennis ball has been shot up from rest with a racket. Suppose the ball reaches a height of 5.5 m. Calculate the net impulse of the force

3. On average, a standard 57.0-g tennis ball is said to be in contact with the tennis racket for 30 milliseconds. Suppose that a serve is done with a speed of 262.8 kph. What amount of force was exerted on the ball during the serve?

4. A block with mass equal to 12 000 g slid across a frictionless surface at 37.0 m/s and hit another block at rest. After the impact, they bounced off of each other with respective velocities of 42.502 mph and 8.948 mph. Determine the mass of the second block.

5. Two balls of masses 10.0 kg and 20.0 kg collided such that the 10.0-kg ball moved with a velocity of 15.66 mph. If the second ball was at rest prior to the collision, what is its final velocity?

 6. Infer the importance of the Conservation of Momentum.

A railway track that is 50 m long, with initial temperature of 10 °C is subjected to a great heat. How much will it expand when its temperature is tripled [α= 13 ´ 10^-6 / °C]?

The two identical charges have a magnitude of ±1.00×10^-6 Coulombs which separated by 1 cm. What is the magnitude of the force separating the charges?

Problem 1. A batter hits a baseball so that it leaves the bat at speed vo = 37.0m/s at an angle αo = 53.1◦, at a location where g = 9.80m/s2.

A standing wave, generated on a string of length L, is represented by the following mathematical expression y(x,t) = 10 sin⁡(2πx) cos⁡(15πt). At what times would all the elements of the string have zero displacement [y(x,?) = 0]?

The Eiffel Tower in Paris is 324 meters tall, and is made primarily of iron, which has a coefficient of linear expansion of 12 x 10-6. The average low in Paris is 1.00°C and the average high is 24°C. What is average change in height the tower experiences each year?