Ten days after it was launched towards mars in December 1998,the mars Climate orbiter spacecraft (mass 629 kg) was 2.87×10^6 km from the earth and travelling at 1.2 ×10^4 km/hr relative to the earth. At this time, what were; a) the spacecrafts kinetic energy relative to the earth?
b) The potential energy of the earth spacecraft system?

An electron and a proton have the same kinetic energy upon entering a region of constant magnetic field and their velocity vectors are perpendicular to the magnetic field. suppose the magnetic field is strong enough to allow the particles to circle in the field. note: you'll need to look up the masses for an electron and proton. 1) what is the ratio of the radii of their circular paths rp/re?

Gas cloud 1 is likely to form a star. gas cloud 2 is not. based on this information, match the given conditions with each cloud

An open cart is moving along a straight frictionless horizontal track. when rain starts falling vertically into the cart, what happens to the speed of the cart?