1. Which of the following pairs has the same dimensions?
(a) specific heat and latent heat (b) Impulse and momentum
(c) surface tension and force
(d) moment of Inertia and torque
2. Electron volt is a unit of
(a) charge
(b) potential difference
(c) energy (d) magnetic force
3. Write S.I unit of luminous intensity and temperature?
4. Under what condition is the relation S= vt correct?
5. What is "Trajectory of a projectile?
6. When does (i) height attained by a projectile maximum? (i) horizontal range is maximum?
7. What is the difference between A and AU.?
8. If the density of a planet is doubled without any change in its radius, how does 'g' change on
the planet
Answers
Answer:
1.Light year and wavelength have the same dimension[L]. Step by step solution by experts to help you in doubt clearance & scoring excellent marks in exams.
2.c) energy
Electron volt, unit of energy commonly used in atomic and nuclear physics, equal to the energy gained by an electron (a charged particle carrying unit electronic charge) when the electrical potential at the electron increases by one volt. The electron volt equals 1.602 × 10−12 erg, or 1.602 × 10−19 joule.
3.candela
The SI unit of luminous intensity is Candela and temperature is Kelvin.
4.This condition is only true if body is moving in uniform velocity, as there will be no acceleration and distance covered per unit time will be constant.
5.Projectile motion is a form of motion where an object moves in a bilaterally symmetrical, parabolic path. The path that the object follows is called its trajectory. Projectile motion only occurs when there is one force applied at the beginning on the trajectory, after which the only interference is from gravity.
6.For maximum height you need 90 degree throw. This will give only a vertical component due to which all force acts in the direction of motion reaching maximum distance. For maximum distance on the other hand is not 180 or 0 degree throw .
7.A° stands for Angstrom. A° is used for measuring very small size. A.U. is used to measure very big size mainly used in measuring distance in space .
8.If the density of the planet is doubled without any change in its radius, g also gets doubled, because g is proportional to the density of the planet. ... Gravity acts on all bodies in proportion to their masses; therefore heavy body falls faster than light body.
Explanation:
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