Tag: physics
Questions Related to physics
Which one of the following is not a fundamental SI unit?
A dimensionless quantity
Some physical quantities are given in Column I and some possible SI units in which these quantities may be expressed are given in Column II. Match the physical quantities in Column I with the units in Column II.
Column I | Column II |
---|---|
i. $GM _eM _s$ | a. (volt) (coulomb) (metre) |
ii. $3RT/M$ | b. $(kilogram)(metre)^3 (second)^2$ |
iii. $F^2/q^2B^2$ | c. $(meter)^2 (second)^{-2}$ |
iv. $GM _e/R _e$ | d. $(farad) (volt)^2 (kg)^{-1}$ |
where G is universal gravitational constant; $M _e$ mass of the earth; $M _s$, mass of sun; $R _e$ radius of the earth; R, universal gas constant;T, absolute temperature; M, molar mass, F, force; q, charge; B, magnetic field.
Pressure (P), density $\displaystyle (\rho )$ and velocity (V) be taken as fundamental quantities for dimensional analysis.
A 50.0 kg boy is sitting on an amusement park ride where he accelerates straight upward from rest to a speed 30.0 m/s in 3.0 s. What is his mass as he accelerates upward?
A plumb bob is hung from the ceiling of a train compartment. the train moves on an inclined track of inclination $30^\circ $ with horizntal. The acceleration of train up the plane is $a=\,g/2$. The angle which the string supporting the bob makes with normal to the ceiling in equilibrium is-
A man of mass 'm' stands on a weighing machine in a lift
List - I | List-II |
---|---|
(a) Lift moves up with uniform acceleration a | (d) mg |
(b) Lift moves down with uniform acceleration a | (e) m(g$+$a) |
(c) Lift moves down with uniform velocity | (f) m(g-a) |
III. The train is increasing its speed.
IV. The train is decreasing its speed.
When a car accelerates rapidly forward, the heads of people in the car seem to jerk backward.
This is best explained by which of the following?