Determining the spring constant problem
A 1000 kg safe is held 2 m above a heavy duty spring when the rope holding it breaks. The safe compresses the spring 50 cm. What is the spring constant?
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The person illustrated below is performing an exercise to build shoulder strength. We need to get an estimate of the moment created by the weight W about his shoulder joint.The length of the upper arm is "a, the length of the forearm is "b",and th
A 1.30 kg box slides down a rough incline plane from a height h of 1.87 m. The box had a speed of 2.33 m/s at the top and a speed of 1.90 m/s at the bottom. Calculate the mechanical energy lost due to friction (as heat, etc.).
A person looking out the window of a stationary train notices that raindrops are falling veritcally down at a speed of 5.0 m/s relative to the ground. When the train moves at a constant velocity, the raindrops make and angle of 25 degrees when the
The box has a mass of 23.0 kg, and the coefficient of kinetic friction between box and floor is 0.300. (a) Find the acceleration of the box.
A 28.5 g bullet strikes a 0.520 kg block attached to a fixed horizontal spring whose spring stiffness constant is 7730N/m . The block is set into vibration with an amplitude of 35.0 cm. What was the speed of the bullet before impact if the bullet
A particle lives for a short time before breaking apart into otherparticles. Suppose it is moving at a speed of 0.972c, and an observer who is stationaryin a laboratory measures the particle's lifetime to be 5.00 x 10-8 s. (a) What is the lifetime
There are two uniform electric fields: E1 is in the positive x direction with 100 N/C, and E2 is in the positive y direction with 50 N/C. How would you draw the electric field lines for these two electric fields? (You may use the scale of 1 line p
A mass-spring system oscillates on a horizontal frictionless surface with an amplitude of 3.24 cm. a) If the spring constant is 234 N/m and the mass is 0.580 kg, determine the mechanical energy of the system.
An image of the moon is focused onto a screen using a converging lens of focal length f = 36.8 cm. The diameter of the moon is 3.48×106 m, and its mean distance from the earth is 3.85×108m. What is the diameter of the moon's image?
A concave mirror has a radius of curvature of 13.4 cm. If a pointlike object is placed 8.31 cm away from the mirror on its principal axis, where is the image? Take a positive answer to be in front of the mirror, and a negative answer to be behind
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