Physics-
General
Easy
Question
A body of radius R and mass m is rolling horizontally without slipping with speed v. It then rolls up a hill to a maximum height h = . The body might be a -
- solid sphere
- hollow sphere
- disc
- ring
The correct answer is: disc
Let I bt the moment of inertia of the body. Then total KE = mv2 + I2
or KE = mv2 + I
According to energy conservation loss in KE = gain in PE.
or v2 = mgh = mg
Solving this, we get I = mR2
i.e., the solid body is a disc
Related Questions to study
Physics-
The moment of inertia of a body about a given axis is 1.2 kg × m2. Initially, the body is at rest. In order to produce a rotational KE of 1500 joule, an angular acceleration of 25 rad/sec2 must be applied about that axis for a duration of -
The moment of inertia of a body about a given axis is 1.2 kg × m2. Initially, the body is at rest. In order to produce a rotational KE of 1500 joule, an angular acceleration of 25 rad/sec2 must be applied about that axis for a duration of -
Physics-General
Physics-
A spherical ball rolls on a table without slipping. Then the fraction of its total energy associated with rotation is -
A spherical ball rolls on a table without slipping. Then the fraction of its total energy associated with rotation is -
Physics-General
Physics-
In C.G.S. system the magnitude of the force is 100 dyne. In another system where the fundamental physical quantities are kilogram, metre and minute, the magnitude of the force is
In C.G.S. system the magnitude of the force is 100 dyne. In another system where the fundamental physical quantities are kilogram, metre and minute, the magnitude of the force is
Physics-General
Physics-
Out of the following, the only pair that does not have identical dimensions is -
Out of the following, the only pair that does not have identical dimensions is -
Physics-General
Physics-
Which is different from others by units -
Which is different from others by units -
Physics-General
Physics-
If the units of mass, length and time are doubled, unit of angular momentum will be -
If the units of mass, length and time are doubled, unit of angular momentum will be -
Physics-General
Physics-
Temperature can be expressed as a derived quantity in terms of any of the following -
Temperature can be expressed as a derived quantity in terms of any of the following -
Physics-General
Physics-
The percentage error in the measurement of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimate of Kinetic energy obtained by measuring mass and speed -
The percentage error in the measurement of mass and speed are 2% and 3% respectively. How much will be the maximum error in the estimate of Kinetic energy obtained by measuring mass and speed -
Physics-General
Physics-
The dimensional formula of a physical quantity x is [M–1L3T–2]. The error in measuring the quantities M, L, and T are 2%, 3% and 4%. The maximum percentage of error that occurs in measuring. The quantity x is-
The dimensional formula of a physical quantity x is [M–1L3T–2]. The error in measuring the quantities M, L, and T are 2%, 3% and 4%. The maximum percentage of error that occurs in measuring. The quantity x is-
Physics-General
Physics-
If P is radiation pressure, C represents speed of light and Q is radiation energy striking a unit area per second, then non zero integers x, y and z such that PxQyCz is dimensionless are -
If P is radiation pressure, C represents speed of light and Q is radiation energy striking a unit area per second, then non zero integers x, y and z such that PxQyCz is dimensionless are -
Physics-General
Physics-
If energy (E), velocity (v) and force (F), be taken as fundamental quantities, then what are the dimensions of mass -
If energy (E), velocity (v) and force (F), be taken as fundamental quantities, then what are the dimensions of mass -
Physics-General
Physics-
In the Cauchy’s formula for the refractive index n = A + B/2 the dimensions of A and B are
In the Cauchy’s formula for the refractive index n = A + B/2 the dimensions of A and B are
Physics-General
Physics-
The time dependence of a physical quantity P is found to be of the form P = where t is time and and P0 is some constant. Then the constant will -
The time dependence of a physical quantity P is found to be of the form P = where t is time and and P0 is some constant. Then the constant will -
Physics-General
Physics-
If Force =(x/density) + C is dimensionally correct, the dimension of x are -
If Force =(x/density) + C is dimensionally correct, the dimension of x are -
Physics-General
Physics-
The equation of a wave is given by y = A sin ; where is the angular velocity and v is the linear velocity. The dimensions of k is -
The equation of a wave is given by y = A sin ; where is the angular velocity and v is the linear velocity. The dimensions of k is -
Physics-General