Gravitation — Physics STD 11 Science — Question

At which point in the trajectory of the ball thrown upward the acceleration is perpendicular to velocity?

Plot a graph between the time period (T) for a simple pendulum and its length (l).

A retarding force is applied to stop a motor car. If the speed of the motor car is doubled, how much more distance will it cover before stopping under the same retarding force?

What will be the effect on the period of oscillation if a soft spring of the same length is used in place of a hard spring?

Fill in the blanks:
The surface area of a solid cylinder of radius 2.0cm and height 10.0cm is equal to ...(mm)²

A particle executing simple harmonic motion comes to rest at the extreme positions. Is the resultant force on the particle zero at these positions according to Newton's first law?

Explain why
When we try to close a water tap with our fingers, fast jets of water gush through the openings between our fingers.

A copper strip AB and an iron strip AC are joined at A. The junction A is maintained at 0^°C and the free ends B and C are maintained at 100^°C. There is a potential difference between:

1. The two ends of the copper strip.
2. The copper end and the iron end at the junction.
3. The two ends of the iron strip.
4. The free ends B and C.

Fill in the blanks using the word (s) from the list appended with statement:
For solids with elastic modulus of rigidity, the shearing force is proportional to . . . while for fluids it is proportional to . . . (shear strain/ rate of shear strain).

Doubling the pressure at constant temperature for a gas but the molecular weight, what will be the effect on velocity?