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A spacecraft that is initially at rest turns on its engine at t = 0. If its mass is m = 3000 kg and the force from the engine is 45 N, what is the acceleration of the spacecraft?
You then run toward the person and push him out of the path of the brick, the instant before the brick reaches him. If you are initially 25 m from the building, how fast do you have to run?
What is the ratio of the final magnitude of the displacement to the total distance walked?
Apparent Weight, A 550-N physics student stands on a bathroom scale in an 850-kg (including the student) elevator that is supported by a cable. As the elevator stands moving, the scale reads 450 N.
Assume that potential V is maintained at x = 0, and that the potential is zero at x = L. In terms of L, d, V, %, and physical constants, derive expressions for (a) The electric field in the wire,
If her tree house is 30 m above the ground, what is the minimum (initial) speed you must use when throwing packages up to her?
Four 75kg spheres are located at the corners of a square of side 0.60m. Calculate the magnitude and direction of the gravitational force on one sphere due to the other three.
Waves on a Stick a flexible stick 2.0 m long is not fixed in any way and is free to vibrate. Make clear drawings of this stick vibrating in its first three harmonics, and then use your drawings to f
Two insulating spheres have radii r1 and r2, masses m1 and m2, and uniformly distributed charges -q1 and q2. They are released from rest when their centers are separated by a distance d.
A few minuteslater, after traveling 100 feet east, the angle of depression tothe same landmark is determined to be 61°. Use this information to determine the height of the balloon.
A gas mixture contains 1.29 g N2 and 0.93 g O2 in a 1.49- L container at 23?. Calculate the mole fraction of N2.
Calculate the deBroglie wavelength of a 1000 kg automobile traveling at 100 km per hour. Calculate the deBroglie wavelength of an electron traveling at 1% of the speed of light.
A series RC circuit has a time constant of 0.960 s. The battery has an emf of 48.0 V, and the maximum current in the circuit is 0.500 mA. What are?
Determine a formula for the coefficient of kinetic friction between block and ramp.
At room temperature what is the strength of the electric field in a 12-gauge copper wire (diameter 2.05 mm) that is needed to cause a 2.75-A current to flow?
Question: A lightning bolt may carry a current of 1.00 x 104 A for a short period of time. What is the resulting magnetic field 100 m from the bolt? Suppose that the bolt extends far above and belo
What should be the index of refraction of a transparent sphere in order for paraxial rays from an infinitely distant object to be brought to a focus at the vertex of the surface opposite the point o
A falling sky diver reaches terminal speed with her parachute closed. After the parachute is opened, what parameters change to decrease this terminal speed?
Question: A 3.0 g bullet of specific heat 128 J/kg.degree C is moving at 180 m/s and enters a bag of sand then stops. If all kinetic energy is converted into heat, by what amount is increase in temp
You then stand, elevating your eyes by a height H = 1.70m, and stop the watch when the top of the Sun again disappears. If the elapsed time is t = 11.1 s, what is the radius r of Earth?
Gloria had a rectangular garden plot last year with an with an area of 60 square feet. This year Gloria's garden plot is one foot wider and three feet shorter than last year's garden, but it has the
Find the distance between the particles at the moment when their velocity vectors are perpendicular to each other.
If the restoring spring of a galvanometer weakens by 25% over the years, what current will give full-scale deflection if it originally required 36 μA?
A spacecraft descends vertically near the surface of Planet X. An upward thrust of 25.0 kn from its engines slows it down at a rate of 1.20 m/S2, but it speeds up at a rate of 0.80 m/S2 with an upwa