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A 46.0-kg girl is standing on a 159-kg plank. Both originally at rest on a frozen lake that constitutes a frictionless, flat surface. The girl begins to walk along the plank at a constant velocity of 1.44i hat bold m/s relative to the plank.
(a) What is the velocity of the plank relative to the ice surface?
(b) What is the girl's velocity relative to the ice surface?
3 point charges are placed on the x-y plane: a +50.0 nC charge at the origin, a -50.0 nC charge on the x-axis at 10.0 cm, Find the total electric force on the +150 nC charge due to the other two
A 50 kg projectile is fired over level land at an angle of 30 degrees above the horizontal with a muzzle velocity of 210 m/s. At the highest point in its trajectory it explodes into two fragments, one of twice as much mass as the other. The less m..
A spring with spring constant k = 210N/m is at first compressed x = 1.90 cm. It is now allowed to relax back to its equilibrium length and then it is stretched an additional 2.30 cm. How much work is completed by the spring during this process.
The planet Mercury has a mass that is 5.00% of that of Earth, and its gravitational acceleration is gmercury = 3.70 m/s2. a) How long does it take for a rock that is dropped from a height of 2.63 m to hit the ground on Mercury?
an electric field as shown in the figure. an electric field of 1000. v/m is directed toward the right. The ball has a mass of 2.00x10^-3 kg, what is the net charge on the ball
Compute the camels eastward displacement
A uniform plank of length 4.7 m and weight 221 N rests horizontally on two supports, with 1.1 m of plank hanging over the right support. To what distance x can a person who weighs 440 N walk on the overhanging part of the plank before it just begi..
Four point charges have the same magnitude of 2.18 x10-12 C and are fixed to the corners of a square that is 3.95 cm on a side. Three of the charges are positive and one is negative. find the magnitude of the net electric field that exists at the ..
What is velocity of wind that is moving the plane
The microwave radiation left over from the Big Bang explosion of the universe has an average energy density of 3.89 × 10-14 J/m3
As a crude model for lightning, consider the ground to be one plate of a parallel-plate capacitor and a cloud at an altitude of 510m to be the other plate.
Two gravitational forces act on a particle, in perpendicular directions. To find the net force, can we add the magnitudes of those two forces?
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