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Q1. Chinook salmon are able to move upstream faster by jumping out of water periodically; this behaviour is called proposing. Suppose a salmon swimming in still water jumps out of the water with a speed of 6.2 m/s at an angle of 45°, sails through the air a distance L before returning to the water, and after that swims a distance L underwater at a speed of 3.5 m/s before beginning another proposing manoeuvre. Find out the average speed of the fish.
Q2. A man sitting in a bosun's chair that dangles from a massless rope, which runs over a massless, frictionless pulley and back down to the man's hand. The combined mass of the man and chair is 86 kg. With what force magnitude should the man pull on rope if he is to rise with upward acceleration of 1.4 m/s2?
A jeweller working with a heated 44 g gold ring must lower the ring's temperature to make it safe to handle. If the ring is initially at 94 degrees Celsius, what mass of water at 25 degrees Celsius is necessary to lower the ring's temperature to 35 d..
How many joules of kinetic energy does a 750-{rm kg} automobile travelling at the typical highway speed of 65 {rm{ mi/h}} have.
Two spherical conductors are connected by a long conducting wire and a total charge of 20.0 μC is placed on this combination. One sphere has a radius of 4.0 cm while the other has a radius of 6.0 cm. Explain the reasoning of the steps that allow you ..
A flight attendant pulls hero 70 N flight bag a distance of 253 m along a level airport floor at a constant velocity. The force she exerts is 40N at an angle of 52.0 degrees above the horizontal.
The forklift and operator have a combined weight of 10000 lb and a center of gravity at G. Find the maximum vertical acceleration given to a pipe, and the normal reactions acting on the wheels.
An insulated Thermos contains 145 cm3 of hot coffee at 89.0 °C. You put in an 11.0 g ice cube at its melting point to cool the coffee. By how many degrees (in Celsius) has your coffee cooled once the ice has melted and equilibrium is reached? Treat c..
Questions on blackbody, Infra-Red Detectors & Optic Lens and Digital Image.
A golfer takes two putts to get his ball into the hole once he is on green. The first putt displaces the ball into the ball 6.7 m east, and the second 2.16 m south. What displacement would have been needed to get the ball into the hole on first putt.
What is the magnitude of the force applied throughout this time? What is the direction of the force applied throughout this time?
Find the total work done on the car
A polar bear of mass 436 kg stands on an ice floe 58.10 cm thick. What is the minimum area of floe that will just support the bear in saltwater of density of 1030 kg/m3? The specific gravity of ice is 0.88.
A string of 22 identical Christmas tree lights are connected in series to a 125 V source. The string dissipates 52 W. What is the comparable resistance of the light string.
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