Write at the write of the substance if the substance is a diatomic molecule, an atom, a solution, a suspension a colloid or an element 1- shaving cream
2- hot cocoa
3- water from swimming pool
4- water from the faucet
5- ocean water in the middle eats with very high salinity
6- city air
7- forest air
8- helium (He)
9- orange juice with pulp
10- cranberry juice
11- pepsi
12- meringue

What is the mass of the water that is being heated? it requires 2,500 joules to raise a certain amount of water (c = 4.186 jig c) from 20.0°c to 60.0°c. o 159 o 40 g o 63 g o 80 g

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

If a hiker that weighs 600 newtons climbs a 50 meter hill, how much gravitational potential energy has the hiker gained?