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Q. A force that varies linearly with time according to a relation F = 4t N is applied to an object travelling with a speed of 16-m/s. If the force decelerates the object to a complete stop in 5s, determine the object's mass. Imagine the force is at first zero.
A person stretches a rope of length 55 m between the top of a building to the base of a tree d = 23 m away. How tall is the building.
If you weigh 690 {rm N} on the earth, what would be your weight on the surface of a neutron star that has same mass as our sun and a diameter of 21.0 {rm km}.
The K-shell ionization energy of copper is 8979 eV. The L-shell ionization energy is 951 eV. Determine the wavelength of the Kα emission line of copper. What should be the minimum voltage be on an x-ray tube with a copper target in order to see the K..
A 150 g ball and a 220 g ball are connected by a 36{rm cm}-long, mass less, rigid rod. The balls rotate about their center of mass at 130 rpm. What is the speed of the 150 g ball.
A 4.5kg dog stands on an 18 kg flatboat at distance D = 6.10m from the shore. It walks 2.4 m along the boat toward shore and then stops. Assuming no friction between the boat and the water, find how far the dog is then from the shore.
The atmospheric pressure at sea level is about 1.0 multiplied by 105 Pa. What is the force at sea level that air exerts on the top of the typical office desk, 159cm long and 86 cm wide?
Polymer diffusion and Calibration of an optical tweezer
Calculate the force required to move an object.
A 4 kg model rocket is launched, expelling 40.00 g of burned fuel from its exhaust at a speed of 550m/s. What is the velocity of the rocket after fuel has burned? Hint: Ignore the external forces of gravity and air resistance.
What greatest height above the break free point does it rise? How high is the break free point above ground.
Find the total number of lines in a 2.90 wide diffraction grating whose third-order spectrum has the 640 hydrogen- spectral line at an angular position of 39.0.
A person exerts a horizontal force of F = 175 N in the test apparatus shown in the drawing. (h = 0.25 m.) Find the horizontal force M that his flexor muscle exerts on his forearm.
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