Answer: Always accelerates in a downward direction
Explanation: Gravity is pulling the ball downward
D Because If Your Going To Have A Contest Its Ganna Have To Be The Same Objectives For Both Contenders
Answer:
A. 873 kJ
B. -436.5 kJ
Explanation:
Parameters given:
Volume of water = 3m³
Density of water = 1000 kg/m³
Height above the earth, h = 30m
The gravitational potential energy, PE, is given as:
PE = m*g*h
Where m is mass and g is acceleration due to gravity.
Mass, m, can be obtained:
Density = mass/volume
Mass = density * volume
Mass, m = 3 * 1000 = 3000kg
=> Potential ENERGY, PE = 3000 * 9.7 * 30
PE = 873000 J = 873 kJ
B. If the height is decreased by 15m,
h = 30 - 15 = 15m
PE = 3000 * 9.7 * 15
PE = 436500 J = 436.5 kJ
Change in PE will be:
ΔPE = PEfinal - PEinitial
ΔPE = 436.5 - 873
ΔPE = -436.5 kJ
Answer:
B. Less force is needed to stop a person that has less mass.
Explanation:
Answer:1. Transparent
2. Transparent
3. Opaque
Explanation: In a transparent medium light can pass through. For opaque objects it does not allow to pass through instead it is reflected back.
