Two inclined frictionless tracks
On complete combustion, a liter of petrol gives off heat equivalent to 3×10^7 J. In a test drive a car weighing 1200 kg including the mass of driver, runs 15 km per liter while moving with uniform speed on a straight track. Assuming that friction offered by the road surface and air to be uniform. calculate the force of friction acting on the car during the drive, if the efficiency of the car engine were =0.5.
09
Nov
On complete combustion, a liter of petrol gives off heat equivalent to 3×10^7 J. In a test drive a car weighing 1200 kg including the mass of driver, runs 15 km per liter while moving with uniform speed on a straight track. Assuming that friction offered by the road surface and air to be uniform. [...]
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a liter of petrol gives off heat equivalent to 3×10^7 J. In a test drive a car weighing 1200 kg including the mass of driver ,
On complete combustion ,
one gradual and the other steep meet at A from where two stones are allowed to slide down from rest ,
one on each tracks as shown in figure. Which of the following statements is correct? ,
Two inclined frictionless tracks ,
An adult weighing 600N raises the centre of gravity of his body by 0.25m while taking each step of 1m length in jogging. If he jogs for 6km, calculate the energy utilised by him in jogging assuming that there is no energy loss dur to friction of ground and air. Assuming that the body of the adult is capable of converting 10% of energy intake in the form of food, calculate the energy equivalent of food that would be required to compensate energy utilised for jogging.
09
Nov
An adult weighing 600N raises the centre of gravity of his body by 0.25m while taking each step of 1m length in jogging. If he jogs for 6km, calculate the energy utilised by him in jogging assuming that there is no energy loss dur to friction of ground and air. Assuming that the body of [...]
Tags:
An adult weighing 600N raises the centre of gravity of his body by 0.25m while taking each step of 1m length in jogging. If he jogs for 6km ,
one gradual and the other steep meet at A from where two stones are allowed to slide down from rest ,
one on each tracks as shown in figure. Which of the following statements is correct? ,
Two inclined frictionless tracks ,
Suppose the average mass of raindrops is 3.0×10^−5 kg and their average terminal velocity 9ms^−1. Calculate the energy transferred by rain to each square metre of the surface at the place which receives 100 cm of rain in a year.
09
Nov
Suppose the average mass of raindrops is 3.0×10^−5 kg and their average terminal velocity 9ms^−1. Calculate the energy transferred by rain to each square metre of the surface at the place which receives 100 cm of rain in a year. one gradual and the other steep meet at A from where two stones are allowed [...]
Two pendulums with identical bobs and length are suspended from a common support such that in rest position the two bobs are in contact. One of the bobs is released after being displaced by 10^o so that it collides elastically head on with the other bob. (a) Describe the motion of two bobs. (b) Draw a graph showing variation in energy of either pendulum with time, for 0 ≤ t ≤ 2T, where T is the period of each pendulum.
09
Nov
Two pendulums with identical bobs and length are suspended from a common support such that in rest position the two bobs are in contact. One of the bobs is released after being displaced by 10^o so that it collides elastically head on with the other bob. (a) Describe the motion of two bobs. (b) Draw [...]
A raindrop of mass 1.00 g falling from a height of 1 km hits the ground with a speed of 50 m s^–1. Calculate (a) the loss of P.E. of the drop. (b) the gain in K.E. of the drop. (c) Is the gain in K.E. equal to loss of P.E.? If not why. Take g = 10 m s^2
09
Nov
A raindrop of mass 1.00 g falling from a height of 1 km hits the ground with a speed of 50 m s^–1. Calculate (a) the loss of P.E. of the drop. (b) the gain in K.E. of the drop. (c) Is the gain in K.E. equal to loss of P.E.? If not why. Take [...]
In a shotput event an athlete throws the shotput of mass 10 kg with an initial speed of 1m/s at 45^∘ from a height 1.5 m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be 10m/s^2, the kinetic energy of the shotput when it just reaches the ground will be
09
Nov
In a shotput event an athlete throws the shotput of mass 10 kg with an initial speed of 1m/s at 45^∘ from a height 1.5 m above ground. Assuming air resistance to be negligible and acceleration due to gravity to be 10m/s^2, the kinetic energy of the shotput when it just reaches the ground will [...]
A raindrop falling from a height h above ground, attains a near terminal velocity when it has fallen through a height (3/4)h. Which of the diagrams shown in figure correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground ?
09
Nov
A raindrop falling from a height h above ground, attains a near terminal velocity when it has fallen through a height (3/4)h. Which of the diagrams shown in figure correctly shows the change in kinetic and potential energy of the drop during its fall up to the ground ? A raindrop falling from a height [...]
A body is moving unidirectionally under the influence of a source of constant power supplying energy. Which of the diagrams shown in figure. Correctly shows the displacement-time curve for its motion ?
09
Nov
A body is moving unidirectionally under the influence of a source of constant power supplying energy. Which of the diagrams shown in figure. Correctly shows the displacement-time curve for its motion ? one gradual and the other steep meet at A from where two stones are allowed to slide down from rest one on each [...]
Two identical ball bearings in contact with each other and resting on a frictionless table are hit heat-on by another ball bearing of the same mass moving initially with a speed V as shown in figure. If the collision is elastic, which of the following (figure) is a possible result after collision ?
09
Nov
Two identical ball bearings in contact with each other and resting on a frictionless table are hit heat-on by another ball bearing of the same mass moving initially with a speed V as shown in figure. If the collision is elastic, which of the following (figure) is a possible result after collision ? one gradual [...]
Two inclined frictionless tracks, one gradual and the other steep meet at A from where two stones are allowed to slide down from rest, one on each tracks as shown in figure. Which of the following statements is correct?
09
Nov
Two inclined frictionless tracks, one gradual and the other steep meet at A from where two stones are allowed to slide down from rest, one on each tracks as shown in figure. Which of the following statements is correct? one gradual and the other steep meet at A from where two stones are allowed to [...]