Answer:
270°
Explanation:
A full rotation is 360° so half (2/4) of it is 180° meaning a quarter (1/4) is 90°
So you can do 90+90+90=270
or 180+90=270
Applying conservation of momentum
Quarterback mass = 80 kg
ball mass = 0.43 kg
Initially both together but horizontal velocity of both 0
initial momentum = 0
Final momentum = 15*0.43 - 80v
initial = final (law of conservation of momentum)
6.45 = 80v
v = 0.08 m/s
Answer:
Q = 2790 J
Explanation:
Mass of silver bar is 250 g
It is heated from 22.0°C to 68.5°C
The specific heat of silver is 0.240 J/g°C
It is required to find the heat absorb by the silver bar. The heat absorbed by an object when heated from one temperature to another is given by :
So, the heat absorbed by the silver bar is 2790 J.
When salt is boiled with water, negative and positive ions of chlorine and sodium feel atracted by positive and negative ions of hydrogen and oxygen. This potential energy goes from up to down when they displace to where they felt atracted. The same that happens when you let a ball fall down to the floor.
