Answer:
You put the add sign, so it would be 49. I don't believe that is what you meant to put though.
Explanation:
Answer
given,
Mass of the runner, M = 70 Kg
speed of the runner on the second base = 4.35 m/s
speed at the base = 0 m/s
Acceleration due to gravity,g = 9.8 m/s²
a) magnitude of mechanical energy lost
Mechanical energy lost is equal top gain in kinetic energy
b) Work done = Force x displacement
W = F. x
F = μ mg
W = μ mg . x
Work done is equal to 662.29 J
using the coefficient of the friction,μ = 0.7
x = 1.38 m
Hence, the runner will slide to 1.38 m.
A ) 14 billion years = 14,000,000,000
b ) 1 year = 365 · 24 · 3,600 = 31,536 · 10³
Answer:
Option D:
Never remove the radiator cap.
Explanation:
When the car engine is hot, especially during a situation where the engine is overheating, NEVER REMOVE THE RADIATOR CAP.
This is because the water in the radiator is now at a very high temperature and pressure. Once the cap is slightly twisted, this high-pressure water can violently erupt through the radiator cap spewing hot water on the face of the persons closest to it.
The best practice is to allow the car engine to cool down before the radiator is opened.
Answer:
<em>The acceleration of the refrigerator together with the objects decreases.</em>
Explanation:
If the mass of the refrigerator is increased by stacking more masses (objects) on it,
and the force applied remains constant, then we know from
F = ma
where
F is the applied force
m is the total mass of the refrigerator and the objects
a is the acceleration of the masses.
If F is constant, and m is increased, the acceleration will decrease
