Friday
May 6, 2016

# Posts by aok

Total # Posts: 23

physics
Derek the drunk driver drives his car off the road, onto a gravel strip next to the road. Derek does not have anti-lock brakes, so his wheels lock when he enters the gravel area, and the car slides to a halt. Derek's car is traveling at a speed of 20m/s when it enters the ...
December 15, 2010

physics
(a) Find the pressure difference on an airplane wing where air flows over the upper surface with a speed of 126 m/s, and along the bottom surface with a speed of 101 m/s. kPa (b) If the area of the wing is 30 m2, what is the net upward force exerted on the wing? kN
December 13, 2010

physics
A hole in an aluminum plate has a diameter of 1.465 cm at 22.80° C. (a) What is the diameter of the hole at 199.0° C (to four significant digits)? (b) At what temperature is the diameter of the hole equal to 1.463 cm (to three significant digits)?
December 10, 2010

physics
(a) Find the pressure difference on an airplane wing where air flows over the upper surface with a speed of 126 m/s, and along the bottom surface with a speed of 101 m/s.(kPa) (b) If the area of the wing is 30 m2, what is the net upward force exerted on the wing? (kN)
December 10, 2010

physics
Suppose 560.0 J of heat is added to a 111-g piece of aluminum at 23.0° C. What is the final temperature of the aluminum?
December 7, 2010

physics
A water tank springs a leak. Find the speed of water emerging from the hole if the leak is 2.5 m below the surface of the water, which is open to the atmosphere.
December 7, 2010

physics
A horizontal pipe contains water at a pressure of 108 kPa flowing with a speed of 1.5 m/s. The pipe narrows to one-half its original diameter. What are the speed and the pressure of the water when the pipe narrows?
December 7, 2010

physics
A train on one track moves in the same direction as a second train on the adjacent track. The first train, which is ahead of the second train and moves with a speed of 31.3 m/s, blows a horn whose frequency is 124 Hz. If the frequency heard on the second train is 136 Hz, what ...
December 7, 2010

PHYSICS
A stationary horn emits a 135-Hz tone. What frequency is heard by a passenger on a train which is moving towards this horn with a speed of 31.3 m/s?
December 7, 2010

physics
When a 0.30-kg mass is attached to a vertical spring, the spring stretches by 15 cm. How much mass (total) must be attached to the spring to result in a 0.86-s period of oscillation?
November 18, 2010

physics
A 0.38-kg mass attached to a spring undergoes simple harmonic motion with a period of 0.63 s. What is the force constant of the spring?
November 18, 2010

physics
The position of a mass oscillating on a spring is given by x = (5.6 cm) cos [2πt / (2.03 s)]. (a) What is the period of this motion? (b) What is the first time the mass is at the position x = 0?
November 18, 2010

physics
A child exerts a tangential 41.9-N force on the rim of a disk-shaped merry-go-round with a radius of 2.25 m. If the merry-go-round starts at rest and acquires an angular speed of 0.086 rev/s in 3.57 s, what is its mass?
November 18, 2010

physics
thank you so much. i'll get working on this.
November 10, 2010

physics
thank you. but i don't think this is the answer they are looking for :(. hypothetically, can we assume elasticity?
November 10, 2010

physics
A delivery truck with a mass of 1700 kg is stopped in the street w/o its brakes on, when a small car hits it from behind. The car has a mass of 650 kg, and is traveling at 3.7m/s immediately before it hits the truck. Both the car and the truck have good bumpers, so assume the ...
November 10, 2010

physics
A delivery truck with a mass of 1700 kg is stopped in the street w/o its brakes on, when a small car hits it from behind. The care has a mass of 650 kg, and is traveling at 3.7m/s immediately before it hits the truck. Both the car and the truck have good bumpers, so assume the...
November 10, 2010

physics
After fixing a flat tire on a bicycle you give the wheel a spin. (a) If its initial angular speed was 5.41 rad/s and it rotated 13.7 revolutions before coming to rest, what was its average angular acceleration?
November 5, 2010

physics
A pulley rotating in the counterclockwise direction is attached to a mass suspended from a string. The mass causes the pulley's angular velocity to decrease with a constant angular acceleration α = -2.2 rad/s2. If the pulley's initial angular velocity is ω = ...
November 4, 2010

physics
A spot of paint on a bicycle tire moves in a circular path of radius 0.27 m. When the spot has traveled a linear distance of 2.18 m, through what angle has the tire rotated? Give your answer in radians.
November 4, 2010

physics
A spot of paint on a bicycle tire moves in a circular path of radius 0.27 m. When the spot has traveled a linear distance of 2.18 m, through what angle has the tire rotated? Give your answer in radians.
November 4, 2010

physics
To make a bounce pass, a player throws a 0.60-kg basketball toward the floor. The ball hits the floor with a speed of 6.5 m/s at an angle of 57° from the vertical. If the ball rebounds with the same speed and angle, what was the impulse delivered to it by the floor?
October 27, 2010

physics
A 82-kg astronaut and a 1300-kg satellite are at rest relative to the space shuttle. The astronaut pushes on the satellite, giving it a speed of 0.24 m/s directly away from the shuttle. Seven-and-a-half seconds later the astronaut comes into contact with the shuttle. What was ...
October 27, 2010

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