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Q1. Suppose the gravitational force between two massive spheres is 100 N. If the distance between the spheres is doubled, what is the force between the masses?
Q2. Scientists are working on a new technique to kill cancer cells by zapping them with ultrahigh-energy (in the range of 10^12W) pulse of light that last for an extremely short time (a few nanoseconds). These short pulses scramble the interior of a cell without causing it to explode, as long pulses would do. We can model a typical such cell as a disk 5.0 micrometer in diameter, with the pulse lasting 4.0ns with an average power of 2.0x10^12W. We will suppose that the energy is spread uniformly over the faces of 100 cells for each pulse.
a). How much energy is given to the cell during this pulse?
b). what is an intensity (in W/m^2) delivered to the cell?
c). what are the maximum values of the electric and magnetic fields in pulse?
After the collision, the 2.00-kg object has a velocity 5.00 m/s to the west. How much kinetic energy was lost throughout the collision.
Find out the depth of the kerosene
An object with a net charge of 44 µC is placed in a uniform electric ?eld of 554 N/C, directed vertically. The acceleration of gravity is 9.81 m/s^2. What is the mass of this object if it ?oats in this electric ?eld?
It's found that string is set into oscillation only at the frequency 880 Hz and 1320 Hz as the frequency of an oscillator is varied over the range 500-1500 Hz. What is the tension in the string.
An old trick to find out if a train is coming is to put your ear on the rails of the track. Why is this more effective than just listening for the sounds the train makes in air.
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An 82 kg parachutist descends through a vertical height of 350 m with constant speed. Find out the increase in entropy produced by the parachutist; assume the air temperature is 21 degrees C.
What is the height of the hill . Find the coefficient of kinetic friction between flight bag and floor.
What is the distance between deer a and c
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