Mechanics | Relativity Answers

A body weighs 0.5kg in air, 0.3kg in water and 0.2kg in a liquid, what is the relative density of the liquid?

7g bullet when fired from a gun into a 1kg block of wood in a vise penetrate the block to a depth of 8cm .what if? This block of wood is placed on a frictionless horizontal surface and a second 7g bullet is fired from the gun into a block. To what depth will the bullet penetrate the block in this case?

A 500 N boy is standing on frictionless roller skates. If someone pulls him, horizontally, with 40 N of force to the North, what will be his acceleration?

A ball is thrown straight upward from the surface of earth which statement best describes the balls velocity and acceleration at the top of its flight

what does the area of velocity-time graph give?

a stone is thrown directly upward with initial speed V0, returning after a certain time to its launch point. When it reaches its maximum height we can say that:
A. displacement is zero
B. Acceleration is zero
C. the position is zero
D. speed is zero
E. time is zero

a deer goes from point a to point b in 7.00 seconds with constant acceleration, traveling 70.0m. Its speed passing through point B is 15.0m / s. The speed at point A was:

A. 35,0 m/s

B. 230 m/s

C. 5,00 m/s

D. 4,29 m/s

E. 260 m/s

The mass of an object is  

 a. equal to its weight on the surface of the Earth

b. equal to its weight in deep space  

c. never equal to its weight 

d. sometime equal to its weight

Water flowing along a horizontal pipe has a speed of 2.27 m/s and a pressure of 4.86 atm. Further along, the pipe narrows so that the cross-sectional area decreases by a factor of 6.44. What is the pressure in the narrow section?

Water flowing along a horizontal pipe has a speed of 2.27 m/s and a pressure of 4.86 atm. Further along, the pipe narrows so that the cross-sectional area decreases by a factor of 6.44. What is the pressure in the narrow section?