Question Answers
Sahay Sir > Question Answers
Among the four graphs, there is only one graph for which average velocity over the time interval (0, T) can vanish for a suitably chosen T. Which one is it?
30
Oct
Among the four graphs, there is only one graph for which average velocity over the time interval (0, T) can vanish for a suitably chosen T. Which one is it? Among the four graphs T) can vanish for a suitably chosen T. Which one is it? there is only one graph for which average velocity [...]
A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m 1000 times. Assume that the potential energy lost each time she lowers the mass is dissipated. (a) How much work does she do against the gravitational force? (b) Fat supplies 3.8 ×10^7 J of energy per kilogram which is converted to mechanical energy with a 20% efficiency rate. How much fat will the dieter use up?
30
Oct
A person trying to lose weight (dieter) lifts a 10 kg mass, one thousand times, to a height of 0.5 m 1000 times. Assume that the potential energy lost each time she lowers the mass is dissipated. (a) How much work does she do against the gravitational force? (b) Fat supplies 3.8 ×10^7 J of [...]
Tags:
A molecule in a gas container hits a horizontal wall with speed 200 m s^−1 and angle 30 degree with the normal ,
A person trying to lose weight (dieter) lifts a 10 kg mass ,
and rebounds with the same speed. Is momentum conserved in the collision ? Is the collision elastic or inelastic ? ,
one thousand times ,
A plank of mass 12 kg is supported by two identical springs as shown in the given figure. The plank always remains horizontal. When the plank is pressed down and released, it performs
30
Oct
A plank of mass 12 kg is supported by two identical springs as shown in the given figure. The plank always remains horizontal. When the plank is pressed down and released, it performs A plank of mass 12 kg is supported by two identical springs as shown in the given figure. The plank always remains [...]
Two pendulum of lengths 1m and 16m are in phase at the mean position at a certain instant of time. If T is the time period of the shorter pendulum, then the minimum time after which they will again be in phase is
30
Oct
Two pendulum of lengths 1m and 16m are in phase at the mean position at a certain instant of time. If T is the time period of the shorter pendulum, then the minimum time after which they will again be in phase is then the minimum time after which they will again be in phase [...]
The blades of a windmill sweep out a circle of area A. (a) If the wind flows at a velocity v perpendicular to the circle, then the mass of the air of density ρ passing through it in time t is ?
30
Oct
The blades of a windmill sweep out a circle of area A. (a) If the wind flows at a velocity v perpendicular to the circle, then the mass of the air of density ρ passing through it in time t is ? The blades of a windmill sweep out a circle of area A. (a) [...]
A particle of mass 0.5 kg travels in a straight line with velocity v=ax^3/2 where a=5m^−1/2s^−1. What is the work done by the net force during its displacement from x=0 to x=2m?
30
Oct
A particle of mass 0.5 kg travels in a straight line with velocity v=ax^3/2 where a=5m^−1/2s^−1. What is the work done by the net force during its displacement from x=0 to x=2m? A particle of mass 0.5 kg travels in a straight line with velocity v=ax^3/2 where a=5m^−1/2s^−1. What is the work done by the [...]
The bob A of a simple pendulum is released from a horizontal position A as shown in in figure. If the length of the pendulum is 1.5m , what is the speed with which the bob arrives at the lowermost point B, given that it dissipates 5% of its initial energy against air resistance ?
30
Oct
The bob A of a simple pendulum is released from a horizontal position A as shown in in figure. If the length of the pendulum is 1.5m , what is the speed with which the bob arrives at the lowermost point B, given that it dissipates 5% of its initial energy against air resistance ? [...]
The displacement of a body executing SHM is given by x = A sin (2 pie t + pie/3) . The first time from t = 0 when the velocity is maximum is
30
Oct
The displacement of a body executing SHM is given by x = A sin (2 pie t + pie/3) . The first time from t = 0 when the velocity is maximum is The displacement of a body executing SHM is given by x = A sin (2 pie t + pie/3) . The first [...]
A mass m attached to a spring of spring constant k is stretched a distance x0 from its equilibrium position and released with no initial velocity. The maximum speed attained by mass
30
Oct
A mass m attached to a spring of spring constant k is stretched a distance x0 from its equilibrium position and released with no initial velocity. The maximum speed attained by mass A mass m attached to a spring of spring constant k is stretched a distance x0 from its equilibrium position and released with [...]
Two particles execute SHM of the same time period along the same straight lines. They cross each other at the mean position while going in opposite directions. Their phase difference is
30
Oct
Two particles execute SHM of the same time period along the same straight lines. They cross each other at the mean position while going in opposite directions. Their phase difference is Two particles execute SHM of the same time period along the same straight lines. They cross each other at the mean position while going [...]