Agrasshopper leaps into the air from the edge of a vertical cliff, as shown. a) the initial speed of the grasshopper and b) the height of the cliff
h=6.74cm
b=1.06m
angle of jump 50degree

An object weigh 40n in air ,weigh 20n when submerged in water,and 30n when submerged in a liquid of unknown liquid density.what is the density of unknown of liquid?

Atomic nuclei of almost all elements consist of

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy