Answer:
See below
Explanation:
Normal force = m g cos 53 = 8 kg * 9.8 m/s^2 * cos 53 = 47.1823 N
no work is done by this force
Force friction = coeff friction * force normal = .4 * 47.1823 = 7.55 N
work of friction = 7.55 * 2 m = 15.1 j
Force Downplane = mg sin 53 = 62.61 N
work = 62.61 * 2 = 125.22 j
Net Force downplane = force downplane - force friction = 55.06 N
net Work = force * distance = 55.06 N * 2 M = 110.12 j
<u>Answer:</u>
The altitude of planet = 5989.198 km
<u>Explanation:</u>
We know that centripetal acceleration, 
, where v is the velocity and r is the radius. In this case both acceleration and velocity is given, so we can find radius of satellite.
v = 
a = 
So, 
We have diameter of earth = 12713 km
Radius of earth = 12713/2 = 6356.5 km
The altitude of planet = Radius of planet - radius of earth
= 12345.698 - 6356.5
= 5989.198 km
Coal is burned to get energy. By burning coal, green houses gases like carbon dioxide, nitrogen oxides and suphur oxides are produced.
Rest of the energy sources given in the option are clean energies.
Answer is A.
The movement of the tectonic plates can cause volcanoes to rise, which forms islands, such as the Hawaiian Islands.
Answer:
Adding salt to the water increases the density of the solution because the salt increases the mass without changing the volume very much.
Explanation: the explanation is in a file
