Questions 1. How much heat is needed to heat up a bathtub full of water to 70 deg Celciius if the
bathtub holds 100kg of water and starts out at 25 deg C
2. How hot will a 50g piece of lead get if 1000 J of energy is added and the initial temp is 40
deg C?
3. What substance will go from 20 deg to 80 deg if it has a mass of 200g and gets heated
with 4620 J of heat energy?
NO LINKS and please answer all 3

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

Why does the equilibrium position of the spring change when a mass is added to the spring? will the mass oscillate around the new equilibrium position of the spring or the previous position without a mass attached to the spring? if the equilibrium position of the spring changes by 20 cm (assuming no initial mass) when a mass is added to the spring with constant 4.9 kg/s^2, what is the mass of the object attached to the spring?

Think you could get me the answers ?