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Q. A neutron star has a mass of (about the mass of our sun) and a radius of (about the height of a good-sized mountain). Assume an object falls from rest near the surface of such a star. How fast would it be moving after it had fallen a distance of 0.010-m? (Assume that the gravitational force is constant over the distance of the fall, and that the star is not rotating.)
An anchor shoots an arrow with a velocity of 45 m/s at the angle of 50 degrees with the horizontal.An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up into the air at th right time and speed ..
After being accelerated to a speed of 1.7×10 5 m/s, the particle enters a uniform magnetic field of strength 1.00 T and travels in a circle of radius 35.0 cm (determined by observing where it hits the screen as shown in the figure). The results of th..
A 120 granite cube slides down a 45 frictionless ramp. At the bottom, just as it exits onto a horizontal table, it collides with a 210 steel cube at rest.
An alpha particle (m = 6.7 x 10^-27kg, q = +3.2 x 10^-19C) has a speed of 30km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle throughout this motion. Find out the electric potential difference.
Tim and Rick both can run at a constant speed Vr and walk at the constant speed Vw, (Vw
At time a grinding wheel has an angular velocity of 22. It has a constant angular acceleration of 28.0 until a circuit breaker trips at time = 1.60 . From then on, the wheel turns by an angle of 438 as it coasts to a stop at constant angular decel..
A flight attendant pulls her 63N flight bag a distance of 312m along a level airport floor at a constant velocity. The force she exerts is 39N at the angle of 59° above the horizontal.
A ball is thrown nearly vertically upward from a point near the edge of a tall building. it misses the edge of the building in ts way down and passes a point 160ft below its starting point 5 seconds after it leaves the thrower's hand.
As observed from Earth, the wavelength of Hβ in the spectrum of the star Megrez in the Big Dipper is 486.112 nm. Laboratory measurements demonstrate that the normal wavelength of this spectral line is 486.133 nm. Is the star coming toward us or mo..
A cannonball launched with an initial velocity of 161 m/s at the angle of 45 degrees follows a parabolic path and hits a balloon at the top of its trajectory. Neglect air resistance, how fast is it going when it hits the balloon? What is the accelera..
Suppose a hanging 1 kg lab mass is attached to a 4.0 kg block on the table. If the coefficient of kinectic friction, mu is 0.20, what is the acceleration of the block.
What mass (in grams) of steam at 100°C should be mixed with 257 g of ice at its melting point, in the thermally insulated container, to produce liquid water at 84.0°C.
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