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A pole vaulted has a mass of 63.9 kilogram. As he approaches the vault, he is running at a speed of 7.5 meter per second and his center of mass is at a height of 1.04 meter. Assuming all of his kinetic energy is transferred to gravitational PE, obtain how high will his center of mass be at the apex of his vault?
A rocket is fired from the ground but at 30m it runs out of fuel, How fast is it going when it comes back down to earth
the engine of a small aircraft m 1400 kg including pilot develops 180 hp. the airplanes speed is increased from 30 ms
A 3 kg box rests on a horizontal surface. An external force 40 N is applied to the box, 30 degrees inclined from top. the box starts its motion from the rest. Find the final speed of the box after it moves 5 meters to the right
A light rod L has a ball with mass m attached to its end, forming a simple pendulum. It is inverted so that the rod is straight up and then released. What are a) Its speed at the lowest point b) The tension in the suspension at that instant?
For the neutral chlorine atom 35,17 CL, determine the mass number and number of protons
two wires are tied to the 300 g sphere. the sphere revolves ina horizontal circle at a constant speed of 7.5 m/s. what is the tension in each of the wires
A hollow cylinder of mass 0.141 kg and radius 4.10 cm has a string wrapped several times around it, Find the acceleration of the cylinder
Electrons are ejected from a metallic surface with speeds ranging up to 4.60 × 105 m/s when light with a wavelength of 625 nm is used. a)What is the work function of the surface? b) What is the cutoff frequency for this surface?
After flying for 15 minute in a wind blowing 42 km/h at an angle of 26 degree south of east, Find the speed of the airplane relative to the air
A ball with m = .5 kg is thrown from the building (40m height) withinitial velocity 15 m/s downwards, find time it takes to reach the maximum height
an electromagnetic wave strikes a 1.91-cm2 section of wall perpendicularly. the rms value of the waves magnetic field
In fair weather, over flat ground, there may be a downward electric field of 155 N/C. Calculate the charge density of the air
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