Motion in a Plane — Physics STD 11 Science — Question

Read each statement below carefully and state, with reasons, if it is true or false: The velocity vector of a particle at a point is always along the tangent to the path of the particle at that point.

Speedometer of a bus measures the instantaneous speed.

Read each statement below carefully and state with reasons, if it is true or false: The total path length is always equal to the magnitude of the displacement vector of a particle.

Force causes acceleration and deceleration of the object.

State if the following statements is true or false. Give reasons for your answer: In an inelastic collision, the final kinetic energy is always less than the initial kinetic energy of the system.

The law showing the relationship between the wavelength of peak emission and temperature of an ideal black-body in Planck's law.

\begin{array}{l}\text { Magnitude of resultant vector } \vec{R}, \\\qquad R=\sqrt{P+Q+2 P Q \cos\theta}\end{array}

The time period of the pendulum hanging from the roof of a stationary vehicle is T. When the car is accelerated with a uniform acceleration a, the time period of the beam will increase.

The function log ot is periodic function.

Latent heat is the amount of heat required to change the state of a substance without changing its temperature.