Physics Answers

how many calories of heat will be needed to raise the temperature of 200 g of iron from 27°c to 80°c

How much force is repelled by two pieces of copper, each weighing 1 g, located at a distance of 100 km, if all the atoms of one and the other piece are "taken away" by electrons, ie all atoms in the samples are completely ionized ?, 

at a depth of 12.5 m of a chemical solvent the pressure at the bottom of the storage tank due to the solvent was 306kpa. Calculate density of the solvent

A distance of 0.002 m separates two objects of equal mass. If the gravitational force between

them is 0.0104 N, find the mass of each object.

A ball is thrown directly downward with an initial speed of 7.95 m/s, from a height of 30.9 m. After what time interval does it strike the ground?

___ s

Nerve impulses in a human body travel at a speed of about 100 m/s. Suppose a person accidentally steps barefoot on a pebble. About how much time does it take the nerve impulse to travel from the foot to the brain (in s)? Assume the person is 1.70 m tall and the nerve impulse travels at uniform speed.

___________ s

A surveyor measures the distance across a straight river by the following method: Starting directly across from a tree on the opposite bank, he walks x = 116 m along the riverbank to establish a baseline. Then he sights across to the tree. The angle from his baseline to the tree is 𝜃 = 34.0°. How wide is the river?

Y = _______ m

is the equation V = V0 + ax dimensionally correct?

A uniform rod 2 m long and weighing 85 N is pivoted to the wall as shown. A weight of 25 N is suspended at the other end of the rod. Find the magnitude of vertical and horizontal components of the force exerted on the pivot as well as the tension in the string.

1. A bullet train accelerates from rest at Tokyo Station to 89 m/s over a distance of 120 m. What acceleration did it experience?