Answer:
t₁ > t₂
Explanation:
A coin is dropped in a lift. It takes time t₁ to reach the floor when lift is stationary. It takes time t₂ when lift is moving up with constant acceleration. Then t₁ > t₂, t₁ = t₂, t₁ >> t₂ , t₂ > t₁
Solution:
Newton's law of motion is given by:
s = ut + (1/2)gt²;
where s is the the distance covered, u is initial velocity, g is the acceleration due to gravity and t is the time taken.
u = 0 m/s, t₁ is the time to reach ground when the light is stationary and t₂ is the time to reach ground when the lift is moving with a constant acceleration a.
hence:
When stationary:
Hence t₂ < t₁, this means that t₁ > t₂.
Answer:
Substance A will release more heat.
Explanation:
Let suppose that both substances experiment an entirely sensible heat process and are incompressible and begin at the same temperature. Physically speaking, specific heat (
), measured in kilojoules per kilogram-degree Celsius, can be described by following expression:
(1)
Where:
- Released heat, measured in kilojoules.
- Sample mass, measured in kilograms.
, 
- Initial and final temperatures of the sample, measured in degrees Celsius.
If we know that 
, 
, 
and 
, then we have the following inequation:
Substance A will release more heat.
Answer:
Fast-moving lava can kill people and falling ash can make it hard for them to breathe. They can also die from famine, fires and earthquakes which can be related to volcanoes. People can lose their possessions as volcanoes can destroy houses, roads and fields. Lava can kill plants and animals too.
Explanation:
Hope this helps :)
Brainliest?
About 50 years ago, mounting evidence was suggesting
that the temperature of Earth's surface has been sharply
increasing for the past couple of centuries. Nowadays,
additional evidence no longer suggests it; it confirms it.
Today's mounting evidence suggests that human activity is
responsible for the increase, but that the increase eventually
spells curtains for much of human activity.
Answer:
Elastic potential energy changes to gravitational potential energy.
Explanation:
its A i did it on edge
