On the surface of earth, a spacecraft has a mass
of 2.00 × 104 kilograms. what is the mass of the
spacecraft at a distance of one earth radius
above earth’s surface?
(1) 5.00 × 10^3 kg (3) 4.90 × 10^4 kg
(2) 2.00 × 10^4 kg (4) 1.96 × 10^5 kg

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)

Scientists follow specific processes in order to determine valid explanations and conclusions from observations. david observed strange lights in the sky above his home outside of roswell, new mexico. the only explanation that makes sense to him is that there are ufos in the area. what should david do next to verify his explanation?

Suppose you plot the distance traveled by an object at various times and you discover that the graph is not a straight line. what does this indicate about the object's acceleration?