Physics Answers

Suppose that a person throws a ball upward at 15 m/s while standing on the edge of a cliff so that the ball can fall to the base of the cliff 50 m below. How long does it take the ball to reach the base of the cliff?

A dam is designed to withstand a pressure of 7840 lb/ft². Find the maximum depth of water that the dam could support.( A dam should not be built this tall—it should be designed to allow water to run over before reaching such dangerous condition.)

A spring stretches 14 cm when an object weighing 28 N is hung from it . what is the spring constant.

 60° = 50 m/s

There is an ongoing repair at Mrs. Trinket's house and a brass window of her house has dimensions of 15 cm by 12 in at 280C.

An ungranulated thermometer reads 2.0 and 12.9at ice andsteam point respectively.calculate the true temperature in kelvin when the thermometer reads 5.0

In the figure above, q₁ = 6.53 nC, q₂ = 13.1 nC, and q₃ = 13.1 nC. If the net force on q₁ is 0, then what would q be?

The capacitance of a parallel plate air capacitor is 350.0mF. When a sheet of a dielectric is inserted between the plates, the capacitance increases to 2100.0mF. What is the permittivity of the dielectric?

The Earth may be considered to be a uniform sphere of radius 6.38 × 106 m. Its mass is assumed to be concentrated at its centre.

Given that the gravitational field strength at the Earth’s surface is 9.81 N kg–1, show that the mass of the Earth is 5.99 × 1024 kg.

What is a ratio? Give several examples of ratios in everyday use.