Abob of mass of 0.18 kilograms is released from a height of 45 meters above the ground level. what is the value of the kinetic energy gained by the bob at the ground level?

250 joules

51 joules

79 joules

8.1 joules

Aforce of 100 newtons is used to move an object a distance of 15 meters with a power of 50 watts. find the work dine and the time it takes to do the work

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?

The index of refraction of the oil is 1.20. what is the minimum thickness t of the oil slick at that spot?