Other Physics Answers

From a lengthof 31m a ball dropped on a horizontal ground rebound with half

of its velocity with which it hits the ground

What is the velocity with which it hits the ground?

What is the time interval between the first and thesecond impacts of the ball

with the ground?

An intensity of a sound wave is measured to be 1.87×104 W/m2 at position A, 120 m away from the source of this sound. A worker at position B, 308 m away from the source hears the sound.

What is the sound level 120 m way from the source?

The Vogon spacecraft passes Earth at a speed of 0.90c. In the laboratory of the ship, a mouse is born which lives 24 h. The dead mouse weighs 180 g and is 13 cm long. Events are observed from the surface of the Earth.

quite an ordinary Earth resident, Arthur Dent.

a) How long does the mouse seem to live according to Arthur's clock?

b) What is Mouse Motion?

c) How tall does the mouse think Arthur is?

Its uses to calculate wavelength of light by Diffraction grating 

Diffraction grating:

Definition, principle, background theory, procedures, it uses to calculate wavelength of light.

Vector a has magnitude 3, vector b has magnitude 4 and the angle between a and b is 60°. What is the value of a · b?

Ali spot a large octopus while diving 40 meters deep in the pacific ocean sea. Given the density of the sea water and the atmosphere pressure is 1025 kg/m^3 and 101.325 kPa

a.) Calculate the pressure exerted on Ali's body.

b.) Calculate the absolute pressure exerted on Ali's body.

A car has an acceleration of 2.4m/s assume that its acceleration remains constant, starting from rest how long does the car require to reach a velocity of 90 km/h ? How far does it travel while reaching that velocity ?

The diagram below shows the velocity against time graph for a stone thrown vertically upwards.

a.Explain what the gradient of the graph represents in this case.

b.Where is the ball in its flight when the time t

is 1.5 s?

c. Use the information on the graph to determine the maximum height attaine

d by the stone.

The diagram below shows the path taken by a boat sailing from port

A.The boat takes 1.5 hours to travel from port A

to port B. It immediately sails from port

B towards port C. The boat takes 2.0 hours

to travel from B to C. The distances travelled for each section of the journey are

shown on the diagram.

As the boat sailed from A to C

, calculate:

a. its average speed in m s−1

b.the magnitude of its displacement.