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Q. An 82 g arrow is fired from a bow whose string exerts an average force of 95N on the arrow over a distance of 77.00 cm. What is the speed of the arrow as it leaves bow?
Q. A 4.0 kg model rocket is launched, expelling 49.0g of burned fuel from its exhaust at a speed of 555m/s. What is the velocity of rocket after the fuel has burned? Hint: Ignore the external forces of gravity and air resistance.
A certain superconducting magnet in the form of a solenoid of length 0.30 m can produce a magnetic field of 13.0 T in its core when its coils carry a current of 105 A. The windings, made of a niobium-titanium alloy, must be cooled to 4.2 K. Find o..
The magnetic field has been measured to be horizontal everywhere along a rectangular path x = 22 cm long and y = 5 cm high. Along the bottom the average magnetic field B1 = 1.3 10-4 tesla, along the sides an average magnetic field B2 = 1.0 10-4 te..
A bucket filled with water exerting a force of 529N is hanging from a rope that is wound around a 0.05 m radius stationary cylinder. If cylinder does not rotate and the bucket hangs straight down, what is the magnitude of torque the bucket produce..
A loudspeaker is placed between two observers who are 120 m apart, along line connecting them. If one observer records a sound level of 52.8 dB and the other records a sound level of 83.5 dB, how far is the speaker from each observer? Enter the longe..
A spherical balloon of volume 4.03 x10^3 cm3 contains helium at the pressure of 1.15 x10^5 Pa. How various moles of helium are in the balloon if the average kinetic energy of the helium atoms is 3.60 x10-22 J.
Find the distance from the mirror to the point where the reflected rays meet.
Whats the coefficient of the kinetic friction of the tire. What is the acceleration of the car.
A certain brand of hotdog cooker works by applying a potential difference of 142 V across opposite ends of a hot dog and allowing it to cook by means of the thermal energy produced.How much electrical energy is transferred to thermal energy.
Describe the full annealing heat treatment for a plain carbon steel.
Fred and Barney are two electric charges that are initially held 1 meter apart and experience an electric repulsion of 10 pounds of force. What would be the force of repulsion between them be if the two were moved closer together so that they were..
A person stretches a rope of length 55 m between the top of a building to the base of a tree d = 23 m away. How tall is the building.
On a workday an average decibel level of the busy street is 89 dB, with 100 cars passing a given point every minute. If the number of cars is reduced to 30 every minute on a weekend, what is the decibel level of street.
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