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A dynamite blast at a quarry launches a rock straight upward, and 1.7 s later it is rising at a rate of 15 m/s. Assuming air resistance has no effect on the rock, calculate its speed (a) at launch and (b)5.5 s after launch.
Jack and Jill are standing on a crate at rest on the frictionless, horizontal surface of a frozen pond. What is the final speed of the crate if Jack jumps first and then a few seconds later Jill jumps in the same direction
An unstable particle with a mass equal to 3.34 multiplied by 10-27 kg is initially at rest. The particle decays into two fragments that fly off with velocities of 0.981c and -0.864c, respectively. Find the masses of the fragments. (Hint: Conserve ..
You are given a container with 56 g of hydrogen atoms. What is the total charge on the electrons in the container
One mole of an ideal monatomic gas is expanded adiabatically and quasi-statically from a pressure of 1,172 kPa and a temperature of 273 K to a pressure of 279 kPa. What is the final volume of the gas in cubic metres?
A 3.08 kg block starts from rest at the top of a 30° incline and accelerates uniformly down the incline, moving 2.13 m in 1.60 s. Find the magnitude of the frictional force acting on the block
A 7.0-kg block slides down a frictionless incline making an angle of 60.0° withthe horizontal. What is the total work done on the blockwhen the block slides 1.1 m
a ball is thrown from a point 1.0m above the ground. the initial velocity is 6.8m/s at an angle of 30 degrees above the horizontal. What is the speed of the ball at the highest point
an elastic cord has an unstreched length of 8.1 m and a cross-section of 2 cm2. if the youngs modulus of the material
Two identical guitar strings are prepared such that they have the same length (2.43 m) and are under the same amount of tension. find the wave propagation speed on the guitar strings
1. How much more light does one collect with a 4-meter diameter telescope in 0.5 minutes than with a 0.5-meter diameter telescope in 4 minutes?
A small 1.85-GBq 198Au source (maximum beta-particle energy0.961 MeV, average 0.315 MeV) is enclosed in a lead shield justthick enough to absorb all the beta particles. a) Estimate the energy ?uence rate due to bremsstrahlung ata point 50 cm away.
Consider a conical pendulum with a 86.0 kg bob on a 10.0 m wire making an angle of ? = 7.00° with the vertical. What is the radial acceleration of the bob
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