The answer is false. The speed of the astronaut cancels out the force of gravity, causing a 'stationary freefall'. While under these effects, it is not required for an astronaut to 'strengthen' his body.
An object moving in a circle is accelerating. Accelerating objects are objects which are changing their velocity.
Answer:
The kinetic energy increases 4 times
Explanation:
Given,
The mass of the car, m = 1500 Kg
The speed of the car doubles from 50 Km/h to 100 Km/h
The kinetic energy at 50 Km/h
K.E = ½mv²
= ½ x 1500 x 50²
= 1875000 J
The kinetic energy of the car at 100 Km/h
K.E = ½mv²
= ½ x 1500 x 100²
= 7500000 J
Hence, the final K.E is 4 times the initial K.E
Answer:
The last significant figure is inherently uncertain because of the rounding off. The rounding-off uncertainty is usually half of the last figure's decimal-place value if no other uncertainty is expressed. As a rule of thumb results of measurements and calculations have a limited number of significant figures.
