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Classical Mechanics
Find the average force needed to accelerate a car weighing 500kg from rest to 72 km/h in a distance of 25m?
Classical Mechanics
Three particles each pf mass 10 grams are placed at the vertices of equilateral triangle of side 30 cm.Find:
(i)Distance of its center of mass from any of its vertex.
(ii)Moment of inertia of the system of particles about an axis passing through the center of mass of the system and perpendicular to the plane containing them.
(i)Distance of its center of mass from any of its vertex.
(ii)Moment of inertia of the system of particles about an axis passing through the center of mass of the system and perpendicular to the plane containing them.
Classical Mechanics
Let me explain with a simple example. Let's assume I have a tubular cylinder setting on a scale. I zero out the scale so the weight of the cylinder is immaterial. I drop a round 5 oz. magnet into the cylinder that is the same diameter. Now it rests at the bottom of the cylinder. If I drop another 5oz. magnet into the cylinder in such a manner that the opposing polarity of the 2nd magnet faces down or opposes the first magnet's polarity, I have one magnet "floating" or levitated in the tube.
Even though the second magnet is suspended in mid-air, the scale reads 10 oz. The weight of the magnet, despite it being suspended, it's weight must be accounted for.
My question then: How can flying saucers (or whatever) be zipping around the skies and not cause several thousand pounds of compression on the surface of the planet? If not at the surface where is weight displacemed?
Even though the second magnet is suspended in mid-air, the scale reads 10 oz. The weight of the magnet, despite it being suspended, it's weight must be accounted for.
My question then: How can flying saucers (or whatever) be zipping around the skies and not cause several thousand pounds of compression on the surface of the planet? If not at the surface where is weight displacemed?
Classical Mechanics
A ball is dropped from the top of a 80 m high tower. If after 2 sec of fall the gravity (g = 10m/s^2) disappears, then time time taken to reach ground since the gravity disappeared is?
Classical Mechanics
A man with a motorcycle driving on a straight road with a speed of 90 km / h . The mass of men along the bike of 100 kg .The officers chasing criminals from behind men using a helicopter , flying at an altitude of 500 m above the ground and at a speed of 144 km / h . The officer dropped the body of mass 400 kg ( without giving the initial speed of the helicopter ) . It turns out objects just overwrite the officer released the man .
In a system that consists of men along with the bike and the object is released attendant , find the acceleration of the center of mass and center of mass equation of motion
In a system that consists of men along with the bike and the object is released attendant , find the acceleration of the center of mass and center of mass equation of motion
Classical Mechanics
Explain what happens to a body when raised to a height from the surface of the earth and given a horizontal velocity V such that
A- 0<V<8.0km/sec
B-V=8km/sec
C-11.2>V>8.0 km/sec
D- V=11.2 km/sec
A- 0<V<8.0km/sec
B-V=8km/sec
C-11.2>V>8.0 km/sec
D- V=11.2 km/sec
Classical Mechanics
A bullet fired from a rifle loses 20% of its speed while passing through a wooden plank. Then minimum number of wooden planks required to completely stop the bullet is?
Classical Mechanics
Let I be the moment of inertia of a uniform square plate about an axis AB that passes through its centre and is parallel to two of its edges. CD is a line in the plane of the plate that passes through the zebra of the plate and make an angle α with AB. The moment of inertia of the plate about axis CD is the equal to?
Classical Mechanics
At t = 0 s a flywheel is rotating at 25 rpm. A motor gives it a constant acceleration of 0.5 rad/s2 until it reaches 70 rpm. The motor is then disconnected. How many revolutions are completed at t = 21 s
Classical Mechanics
Two trolleys A and B are free to move on a level frictionless track, and are initially stationary. A man on trolley A throws a bag of mass 10 kg with a horizontal velocity of 4 m/s with respect to himself on to trolley B of mass 100 kg. The combined mass of trolley A (excluding bag) and the man is 140 kg. Find the ratio of velocities of trolleys A and B, just after the bag lands on trolley B.
