Mechanics | Relativity Answers

A cardinal flies east for 2.9 s in a horizontal plane

for a distance of 22 m from a fence post to a bush.

It then flies north another 11 m to a bird feeder

for 1.5 s.

(a) Calculate the total distance travelled.

(b) Calculate the cardinal’s average speed.

(c) Calculate the cardinal’s average velocity.

A bullet of mass 0.4 kilograms is fired towards a stationary wood block. The wood block is kept on a rough horizontal surface. The mass of the block is 0.6 kilograms. After the collision the bullet gets embedded in the block and they move as a single object. The coefficient of friction between the block and the horizontal surface is 0.4. calculator the velocity of the block with the bullet just after the collision.

In a space 5.82 x 1000000kg rocket experiences a constant force of 6.94 x 1000000000N in the direction of its movement. At time t = 0s,it flies past a planet at a velocity of 57.2m/s. How far away is the rocket from the planet when t = 25.4s?

a cheetah moving with constant acceleration covers the distance between two points 105.0 m apart in 4.7 s. its speed as it passes the second point is 35.5 m/s what are its speed at the first point?

when 2.7 kg of salt solution is poured into a cylindrical bottle, 200mm in diameter, the liquid level rise by 75mm. calculate the density and specific gravity

Find the diameter of an 18 m (L) long steel wire that will stretch no more than 9 mm(∆L) when a load (stress) of 3800 N is hung on the end of the wire. The Young’s Modulus for steel wire is 200 x 10⁹ N/m²

Juan pulls the sled with a force of 255 N moving
horizontally 10.00 m.

what is the work done by Juan on the sled

A vertical angle of -12°25' is measured to the top of a water tank from an instrument set up on a hill 585.0m away from it. The telescope of the instrument is 1.45m above the ground whose elevation is 462.73m. considering the effects of earth's curvature and refraction, determine the elevation of the base of the water tank if the tank is 32.0m high.

105.0 m apart in 4.7 s. Its speed as it passes the second point is 35.5, what are its speed at the first point?

.A diver is poised to jump from a diving board 3 meters long. (a) If he has a mass of 60 kg

and stands on his toes at the edge of the board, what torque is produced by his weight on the board? (b) Where on the board would he have to stand in order to produce a torque of 900 Nm?