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A spacecraft engine creates 55.1 MN of thrust with a propellant velocity of 4.88 km/s. (a) Find the rate (dm/dt) at which the propellant is expelled. (b) If the initial mass is 2.08 x 10^6 and the final mass is 6.78 x 10^4 kg, find the final speed of the spacecraft (assume the initial speed is zero and any gravitational fields are small enough to be ignored). (c) Find the average acceleration till burnout (the time at which the propellant is used up; assume the mass flow rate is constant until that time).
A small button placed on a horizontal rotating platform withdiameter 0.310 m will revolve with theplatform when it is brought up to a speed of 35.0 rev/min, provided the button is no more than0.128 m from the axis.
A parallel beam of light with an energy flux S of 10 W/cm2 falls for 1 hour on a perfectly reflecting plane mirror of 1.0 cm2 area. what force acts on the mirror
IP Suppose a planet is discovered that has the same amount of mass in a given volume as the earth, but has radius 1/6 R Earth. Calculate the acceleration due to gravity on this planed
A dipole composed of a ±q point charge, separated by a distance d = 2.24e-14 m and aligned parallel with the x axis, Find the expression for the potential on the x axis
A red laser pointer with a wavelength of 635 nm is shined on a double slit producing a diffraction pattern on a screen that is 1.91 m behind the double slit. The central maximum of the diffraction pattern has a width of 4.15 cm
It is claimed that if a lead bullet goes fast enough, it can melt completely when it comes to a halt suddenly, and all its kinetic energy is converted into heat via friction. Find the minimum speed of a lead bullet (initial temperature = 39.0° C) for..
A hill that has a 25.7% grade is one that rises 25.7 m, At what angle is such a hill inclined above the horizontal
You have been given a long lenght of wire. You measure the resistance of the wire, What is the resistance of one of those sections
describe the importance of rare earth elements in science and technology. assess the most common uses of these
Three air carts have masses, 4m,2m and m. the most massive cart hasan initial speed of Vo; the other two carts are at restinitially. All carts are equipped with spring bumpers that giveelastic collisions.
0.20g of hydrogen gas are held in a rigid container. The temperature of the gas is changed from 50 K to 80 K. How much heat is needed.
A single-turn circular loop of radius 8.00 cm is to produce a field at its center that will just cancel the earth's field of magnitude 0.7G directed at 70 below the horizontal north direction. Find out the current in the loop.
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