Mechanics | Relativity Answers

an helicopter hoovers clear on the ground issuing slip diameter 20 meters at speed of 20 m/s. Determine the mass flow rate of the air passing through the rotor and the mass of the helicopter?

You are going on a bicycle ride with a friend. You start 3.0 min ahead of her from her carport, pedal at 7.0 m/s for 10 min, then stop and chat with a neighbor for 4.0 min . As you chat, your friend pedals by, oblivious to you. You notice that she's forgotten to bring the lunch basket you plan to share, and you immediately start to pedal back to her house to get it, now moving at 12 m/s . When you are halfway back, your friend catches up with you, having herself remembered about the basket.

1.What was the magnitude of her average velocity for the trip up to that instant? Treat the trip as though it began at the same time for both of you, and you friend maintained zero velocity for three minutes.

2.What was the magnitude of her average velocity between the instant she passed you and the neighbor and the instant she caught up with you?

A projectile's launch speed is 6.70 times its speed at maximum height. Find the launch angle θ0.

The gravitational force acting on the satellite is always directed towards the centre of Earth does this force exerts torque on the satellite?

You and your friend are running in a long racetrack. You pass the starting line at a constant 4 meters per second. Seventeen seconds later, your friend passes the starting line while running at 6 meters per second in the same direction, and at the same instant you increase your speed to 5 meters per second.

A centrifuge in the shape of a uniform cylinder of radius 20 cm and mass 10 kg cylinder is spinning about its axis at a speed of 50,000 rpm. Determine the torque that must be applied in order to bring the centrifuge to a stop in 20 s. Calculate the power dissipated.

A typical mountaineer rope about 35cm long will give a distance of about 1.6m under the weight of a climber hanging freely on the load. Assuming the climbers mass is 80kg, estimate the period of vertical oscillation of the climber when dangling freely on the end of the rope how does this compare with the period of solving of the climber "pendulum"

Two objects are connected by a light string that passes over a frictionless pulley. The coefficient of sliding friction between the 4kg object and surface is 0.30. Find the acceleration of the two object and tension in the string, other object is 10kg

A bullet of mass 55g is shot through a watermelon with mass 1.2kg. the watermelon flies back at 1.5m/s with the bullet inside. what was the bullet’s speed upon entering the watermelon?

Two rollerbladers face each other and stand at rest on a flat parking lot. Tony has a mass of 65kg, and Tim has a mass of 52kg. when the push off against one another, Tim acquires a speed of 0.63 m/s. What is Tony’s speed?