Calculate the force of gravity between a human child
Calculate the force of gravity between a human child (mass = 28 kg) and the planet Mars (mass = 6.4 1023 kg), when Mars is at its closest to Earth (distance = 8. 1010 m).
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A force vector has a magnitude of 580 newtons and points at an angle 39o of below the positive x axis. What are (a) the x scalar component and (b) the y scalar component of the vector.
Drawing on Eratoshthenes' method, if two observers are due north and south of each other and are seperated by 400 km, what is the circumference of their spherical world if they see the same star on their meridian at altitudes of 23 degrees and 47
What must the charge (sign and magnitude) of a particle of mass 1.45 g be for it to remain stationary when placed in a downward-directed electric field of magnitude 620 N/C? Use 9.8m/s/s for the magnitude of the acceleration due to gravity.
A 1500-kg car moving east at 20 m/s collides with a 1600-kg car moving south at 15 m/s and the two cars stick together. What is the velocity of the cars right after the collision?
Two cylindrical bars, each with diameter of 2.50 cm, are welded together end to end. One of the original bars is copper and is 0.360 m long. The other bar is iron and is 0.180 m long. What is the resistance between the ends of the welded bar at 20
A 8.00 kg object oscillates at the end of a vertical spring that has a spring constant of 2.05 104 N/m. The effect of air resistance is represented by the damping coefficient b = 3.00 N·s/m. (a) Calculate the frequency of the dampened oscil
The inner surface is negative relative to the outer surface. How much work is required to eject a positive sodium ion (Na+) from the interior of the cell?
Determine the electric potential as a function of distance r from the center of the sphere for A) r>ro, B) r<ro. Take V=0 at r=infinity. C) Plot V versus r and E versus r.
A hot iron horseshoe (mass=0.45 kg), just forged is dropped into 1.64 L of water in a 0.35-kg iron pot initially at 20 degree celsius. If the final equilibrium temperature is 24.0 degree cesius, estimate the initial temperature of the hot horsesh
Calculate the electric field for: a) r < a; b) a < r < b; c) b < r < c; d) r > c; e) What is the charge on the inner surface of the hollow sphere? f) What is the charge on the outer surface?
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