Answer:
a) , b)
Explanation:
a) The package handling system is modelled by using the Principle of Energy Conservation and the Work-Energy Theorem:
The final kinetic energy is:
The final speed is:
b) The maximum speed of the box during its motion occurs at the beginning of the movement, since the work done by friction is non-conservative and reduces speed as box travels on the horizontal surface. Hence, the maximum velocity is:
The correct option is A.
Refraction refers to the process of change in the direction of a wave propagation due to change in the transmission medium. When light travels from air to water, it slows down and this causes it to change direction slightly. The change in direction is called refraction. When light enters a denser medium, it bends more towards the normal line, the amount of bending that will be experienced depend on change in speed and angle of the incident ray.
Answer:
4L
Explanation:
mass of pendulum = M, length of pendulum, L1 = L,
acceleration due to gravity = g, Amplitude = A
Use the formula for the time period for simple pendulum
..... (11)
Let the new length be L2 for which the time period is 2T.
..... (2)
Divide equation (2) by equation (1)
So, L2 = 4 L
Thus, the length of the pendulum is 4 L.
Dark matter has been detected by its gravitational pull.