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1. Why is it tiring to push hard against a solid wall?
2. When a person pushes hard on a solid wall, is work done?
Sam heaves a shot with weight 16-lb straight upward, giving it a constant upward acceleration from rest of 45.9 m/s^2 for a height 61.0 cm. How much time does he have to get out of its way before it returns to the height of the top of his head, a ..
A 0.2 kg steel ball is dropped straight down onto a hard, horizontal floor and bounces straight up. FIND the magnitude of the impulse delivered to the floor by the steel ball
In 0.2s, a coil of die with 50 loops experiences an average induced emf of 9v due to a changing magnetic field perpendicular to the plane of the coil. what is the final strength of the field
If 1800J of heat are added to a 190-g object, its temperature increases by 10o C. What is the heat capacity of this object
Rhea, one of Saturn's moons, has a radius of 765 km andan acceleration due to gravity of 0.278 m/s2 at itssurface. Calculate its mass and average density
A metal rod of length 2.0 m is moved at 6.0 m/s in a direction perpendicular to its length. A 5.0 m T magnetic field is perpendicular to both the rod and its velocity. If the resistance of the rod is 15 mΩ, what is the current in the rod?
A thin, flat washer is a disk with an outer diameter of 14 cm and a hole in the center with a diameter of 2 cm. The washer has a uniform charge distribution and a total charge of 8 nC. What is the electric field on the axis of the washer at a distanc..
An aquarium filled with water (n=1.33) has flat glass sides whose index of refraction is 1.52. What is the critical angle from the glass to the water
A 1.2 kg block rests on a frictionless surface and is attached to a horizontal spring of constant k = 25 N/m. The block is oscillating with amplitude 10 cm and with phase constant? = -π/ 2 . A block of mass0.80 kg is moving from the right at 1.7 m/s.
One of the moons of a planet orbits at a distance of 9375 km from the center of the planet. what is the period of the moon
an electron is fired with speed 2400 ms into a region of uniform electric field with magnitude 8 nc. assuming the
the earth puts a gravitational force on the moon. the moon puts a gravitational force on the earth. how do the
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