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

Astronomers discover an exoplanet (a planet of a star other than the sun) that has an orbital period of 3.87 earth years in its circular orbit around its sun, which is a star with a measured mass of 3.59 x 1030 kg. find the radius of the exoplanet's orbit.

An object has a weight of 500 on earth what is the mass of this object

You are a sales representative for a company that makes a new alternate fuel for vehicles. you have prepared a presentation for the environmental engineers to sell your new product. what question do you expect the audience to ask regarding whether the new fuel will cause less damage to the environment? a. do we have to change any parts of the vehicle to use this alternate fuel? b. will the vehicles get better fuel mileage with the alternate fuel? c. how much greenhouse gas does your fuel produce compared with current fuel sources? d. is the alternate fuel more expensive than fossil fuel?