Bank robbers have pushed a 1000 safe to a second-story floor-to-ceiling window. they plan to break the window, then lower the safe 3.0 m to their truck. they stack up 500 of furniture, tie a rope between the safe and the furniture, and place the rope over a pulley that is frictionless and massless. they then push the safe out of the window. what is the safe’s speed when it hits the truck if it was initially at rest after being pushed out of the window? the coefficient of kinetic friction between the furniture and the floor is 0.50

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?

You charge a parallel-plate capacitor, remove it from the battery, and prevent the wires connected to the plates from touching each other. when you increase the plate separation, what happens to the following quantities?

Which of the following is not a means to accelerating? question 4 options: a)increase speed b)remain still c)decrease speed d)change direction