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Q1. A 60 m ladder leans against a wall. What is the minimum force of friction essential to prevent the ladder from sliding? Presume that the force in the wall is negligible.
Q2. Two identical diverging lenses are separated by 12 cm. The focal length of each lens is -7.0 cm. An object is located 5.0 cm to the left of the lens that is on the left. Find out the final image distance relative to the lens on the right.
Q3. Radioactive isotopes frequently occur together in mixtures. Assume a 400g sample contains, with a half-life of 12 days, and, with a half-life of 4.5 days. If there are firstly twice as many calcium atoms as there are barium atoms, what will be the ratio of calcium atoms to barium atoms 3.50 weeks later?
A small ball is doing circular motion around a pole. The string connecting the pole and the ball is 30 degrees (?) away from the pole. Find the linear speed of the ball
A juggling bag is thrown straight up into the air and is caught 3 s later, What is the initial velocity of the bag
An anchor shoots an arrow with a velocity of 45 m/s at the angle of 50 degrees with the horizontal.An assistant standing on the level ground 150 m downrange from the launch point throws an apple straight up into the air at th right time and speed ..
A jet engine emits sound uniformly in all directions, radiating an acoustic power of 2.17 × 102 kW. Find the intensity of the sound
A particle with a charge of q = -5.00 nC is moving in the uniform magnetic field of vec{B}=( -1.20 T ) hat{z}. The magnetic force on the particle is measured to be vec{F}= ( -7.60×10-7 N )hat{y}.
what is the mass of helium in the balloon.
A spacecraft flies towards the Earth at a speed of 0.8c and shines a laser at an observer on Earth. At what speed would the laser light be moving
a girl of mass 40 kg is in a rocket ship an altidude of 35 km above the surface of the earth. Find the gravitational force on the girl by the earth
A golf club strikes a 0.044-kg golf ball in order to launch it from the tee. For simplicity, With what speed does the ball leave the club
question1a war-wolf or trebuchet was a device used throughout the middle ages to throw rocks at castles and now
A heat engine that is 58.6% efficient does 235.4 kJ of work. How much thermal energy input was required to perform this work
A spool of thin wire (with inner radius r = 0.50 m, outer radius R = 0.65 m, and moment of inertia I_cm = 1.1323 kg*m2) pivots on a shaft.
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