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A 1000 kg roller coaster starts from rest at height H= 25 m above the bottom of a 14 m diameter loop. If the friction betwen the car and the track is negligbe, determine the speed of the car when the upside-down car is at the top of the loop. What is the downward force of the track on the car at the top of the loop?
The objective lens of a telescope is a symmetric glass lens with 100cm radii of curvature. The eyepiece lens is also a symmetric glass lens. What are the radii of curvature of the eyepiece lens
During a very quick stop, a car decelerates at 7.2 m/s2. Assume the forward motion of the car corresponds to a positive direction for the rotation of the tires, How long does the car take to stop completely in seconds
Calculate the number of coulombs of positive charge in 270 cm3 of (neutral) water. (Hint: A hydrogen atom contains one proton and an oxygen atom contains eight protons.) I keep getting 1.4E7 and its showing up wrong.
A driver measures her "cold" tire gauge pressure to be 2.02 105 Pa. The measurement is made before driving, Find the final temperature of the air in the tires
A billiard ball strikes and rebounds from the cushion of a pool table perpendicularly. The mass of the ball is 0.38 kg. What is the average net force (magnitude and direction) exerted on the ball by the cushion
Density is the ratio of an object;s mass to its volume. Would you except density to be a vector or a sdcalar quanity? Explain.
A place-kicker must kick a football from a point 36.0 m (about 40 yards) from the goal. By how much does the ball clear or fall short (vertically) of clearing the crossbar
A positron is a particle with the same mass and magnitude charge as an electron, but a positron has a positive charge. how fast is the positron moving
Two protons, each having a speed of 0.970c in the laboratory, are moving toward each other. Determine the momentum of each proton in the laboratory
A person has severe hearing loss that reduces the intensity in his inner ear by 31.5 dB. What amplification factor is needed for this person
Two 0.70g spheres are charged equally and placed 2.4 cm apart. what is the charge on each sphere
a bus contains a 1740 kg wheel (a disk that has a .56 m radius) and has a total mass of 9600 kg. How high can the bus climb with this stored energy and still have a speed of 3.10 m/s at the top of the hill
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