Laws of Motion — Physics STD 11 Science — Question

A body of mass 25g is moving with a constant velocity of 5m/ sec on a horizontal frictionless surface in vacuum. What is the force acting on the body?

A steel rod of cross-sectional area 4cm² and length 2m shrinks by 0.1cm as the temperature decreases in night. If the rod is clamped at both ends during the day hours, find the tension developed in it during night hours. Young's modulus of steel = 1.9 × 10¹¹N/m².

The elastic limit of steel is 8 × 10⁸N/m² and its Young's modulus 2 x 10¹¹N/m². Find the maximum elongation of a half meter steel wire that can be given without exceeding the elastic limit.

A vertical metal cylinder of radius 2cm and length 2m is fixed at the lower end and a load of 100kg is put on it. Find

1. The stress.
2. The strain and.
3. The compression of the cylinder. Young's modulus of the metal = 2 × 10¹¹ N/m².

The length of the string of a simple pendulum is measured with a metre scale to be 90.0cm. The radius of the bob plus the length of the hook is calculated to be 2.13cm using measurements with a slide callipers. What is the effective length of the pendulum? (The effective length is defined as the distance between the point of suspension and the centre of the bob.)

Name one factor on which the period of revolution of a planet around the Sun depends.

What is I second's pendulum? What is the length of a second's pendulum?

Electron volt is the unit of which physical quantity?

Find the increase in pressure required to decrease the volume of a water sample by 0.01%. Bulk modulus of water = 2.1 × 10⁹N/m².

A girl is swinging if the girl starts steep swinging, what will be the effect on the period?