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Stationary railroad whistle is sounded. An echo is heard 5.0 seconds later by the train's engineer. If the speed of sound is 343 m/s, how far away is the reflecting surface?"
An object of mass 3.8 kg has a kinetic energy equal to 430 J. Calculate the velocity of the object.
A 5.00 Lb box sliding with a speed of 14.0 ft/sec along a horizontal surface encounters a rough area of the surface and comes to a stop at 1.35 sec later. what is the deceleration of the box?
It absorbs a photon that raises it to the next-higher energy level. what is the energy of the photon and what is the photon's frequency?
if the period of a pendulum on another planet is four times its period measured on earth, what is the gravitational acceleration on the planet?
As part of a safety investigation, two 1200 kg cars traveling at 24 m/s are crashed into different barriers. Find the average forces exerted on (a) the car that hits a line of water barrels and tak
If the height of the water slide in the figure is h = 3.3 m and the person's initial speed at point A is 0.48 m/s, what is the new horizontal distance L between the base of the slide and the splash
Mr. Gewanter, whose mass is 60.0 kg, is doing a physics demonstration in the front of the classroom. a) How much gravitational force does he exert on 55.0-kg Martha in the front row, 1.50 m away? b
Which of the following will result in the greatest acceleration?
The block of mass 4M moves to the right with a speed of v1=1.58 m/s. What is the velocity of the block of mass M? Calculate the original elastic energy in the spring if M = 0.365 kg.
what is the minimum value for the hanging weight to the nearest tenth of a kilogram if L = 1.7 meters and the configuration is to remain stable"
An undersea research chamber is spherical with an external diameter of 5.40 m. The mass of the chamber, when occupied, is 70400 kg. It is anchored to the sea bottom by a cable. Calculate the followi
A 800·kg elevator is attached to a cable whose tension is 8100·N. What is the magnitude of the elevator's acceleration?
If the Hawaiian hot spot is a fixed hot spot, which of the following directions is closest to the direction that the Pacific Plate was apparently moving when the Emperor Seamount Chain formed?
A massive steel cable drags a 25.0 kg block across a horizontal, frictionless surface. A 90.0 N force applied to the cable causes the block to reach a speed of 4.50 m/s in 1.50 s. What is the differ
Leroy, who has a mass of 71 kg, is skateboarding at 6.5 m/s when he smacks into a brick wall and comes to a dead stop in 0.2 s.
A 1000 {rm kg} wrecking ball hangs from a 15 {rm m}-long cable. The ball is pulled back until the cable makes an angle of 25.0^circle with the vertical. By how much has the gravitational potential
Sam, whose mass is 80.0 kg, takes off down a 55.0 m high, 10.0^circ slope on his jet-powered skis. The skis have a thrust of 220 N. Sam's speed at the bottom is 40.0 {rm m/s}. What is the coefficie
An 80-cm-long wire is made by welding a 4.6 mm-diameter, 20-cm-long copper wire to a 4.6 mm-diameter, 60-cm-long iron wire. What is the resistance of the composite wire?
A 3.00 kg steel ball strikes a wall with a speed of 13.0 m/s at an angle of 60.0° with the surface. It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.20
She comes to rest 1.07 m under the surface of the water. Determine the magnitude of the average force that the water exerts on the diver. This force is nonconservative.
What is the Rydberg constant? How can you identify an unknown atom using the atomic spectrum?
A uniform door weighs 50.0 N and is 1.0 m wide and 2.7 m high. What is the magnitude of the torque due to the door's own weight about a horizontal axis perpendicular to the door and passing through
A fan rotating at 20 rpm slows down with a constant acceleration and comes to a stop in a time of 4.7 s. What is its angular displacement in this time? Give your answer in radians, do not enter uni
How many 110 W lightbulbs can you use in a 122 V circuit without tripping a 17 A circuit breaker? (The bulbs are connected in parallel, which means that the potential difference across each lightbu