The distance from the sun to Neptune is about the same as the distance from Neptune to the next closest star, Proxima Centauri
If the collision is elastic, there is no loss in kinetic energies, which means that the total energies before and after impact are the same. So no need to worry about final velocities.
Final energy
= initial energy
= (1/2) (7.20*2.00^2+5.75*(-1.30)^2)
=19.26 joules
Answer: the total kinetic energy is 19.3 J. after collision.
Answer:
A negative acceleration
Explanation:
When thrown, the basketball leaves the hands of the thrower with an initial velocity. This initial velocity is then gradually decelerated (negative acceleration) by drag forces, and its gravitational attraction to the earth, until the ball comes to rest. The acceleration on a thrown basketball is therefore negative.
Answer:
The answer is question number A. Change in abiotic factors
Answer:
The mass of the earth is, M = 5.98 x 10²⁴ kg
Explanation:
Given data,
The acceleration due to gravity, g = 9.8 m/s²
The radius of Earth, R = 6400 km
=6.4 x 10⁶ m
The universal gravitational constant, G = 6.67 x 10 ⁻¹¹ Nm²kg⁻²
Using the equation,
<em>GM = gR²</em>
M = gR² / G
Substituting the values,
M = 9.8 x (6.4 x 10⁶)² / 6.67 x 10 ⁻¹¹
= 5.98 x 10²⁴ kg
Hence, the mass of the earth is, M = 5.98 x 10²⁴ kg