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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).
From the point (3000,4000,0) the next destination is at the point (-2000,16000,0) a force of 2 N is applied in the direction of π radians. An appropriate force is applied in the direction of π/2 radians so that the resultant vector is in the direc..
person walks 25.0° north of east for 3-km. How far would another person walk due north and due east to arrive at the equal location?
To investigate the structure of extremely small objects, such as viruses, the wavelength of the probing wave should be about one-tenth the size of the object for sharp images. If you use light of this wavelength, what would be the energy (in eV) of..
Two tugboats pull a disabled supertanker. Each tug exerts a constant force of 1.20×10^6N , one at an angle 17.0 degrees west of north, What is the total work done by the two tugboats on the supertanker
A projectile launcher has a muzzle velocity of 15m/s and is aimed 60 degree above the horizontal. How far horizontally did the ball travel before it hit the floor
A Boeing 747 jet with a wingspan of 60.0 m is flying horizontally at a speed of 324 m/s over Phoenix, What voltage is generated between the wingtips
A train is rounding a circular curve whose radius is 2.00 multiply.gif 102 m. Find the magnitude of the total acceleration (centripetal plus tangential) of the train
an 1800 kg car is moving at 14 m/s slows to 8.0 m/s in 4.4 s. Use the impulse momentum theorem to find the magnitude of the force on the car
A vibration sensor, used in testing a washing machine, consists of a cube of aluminum 1.50 cm on edge mounted on one end of a strip of spring steel (like a hacksaw blade) that lies in a vertical plane. what is its frequency of vibration
An 8-kg ball hanging from the ceiling by a light wire 135cm long is struck in an elastic collision by a 2 kg ball moving horizontally at 5.00 m/s just before the collision. Find the tension in the wire just after collision.
A 1.5 mm-diameter, 40 cm -long copper wire carries a 4.5 A current. What is the potential difference between the ends of the wire
A bucket filled with dirt of mass 22 kg is suspended by a rope that hangs over a pulley of mass 31kg and radius 0.15 m. everything is at first at rest.
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