1.) A fast moving vehicle travelling at a speed of 33.9 m/s comes up behind another...

1.) A fast moving vehicle travelling at a speed of 33.9 m/s comes up behind another vehicle which is travelling at a slower, constant speed of 15.4 m/s. If the faster vehicle does not begin braking until it is 15.8 meters away from the car in front of it, what is the minimum acceleration that the faster car must exhibit if it is to avoid colliding with the car in front? Assume that both cars are travelling in the positive direction. 2.)A college student stands on a balcony of a sorority house a distance of 10.0 meters above the ground. Her sorority sister is on the ground below the balcony, and tosses her keys straight upward toward her friend who catches the keys 4.9 seconds later. With what speed were the keys initially thrown?

Expert Solution

genius_generous answered 6 months ago

The speed of the two planes is 52.7 m/s, with the first plane travelling at this...

The speed of the two planes is 52.7 m/s, with the first plane travelling at this velocity in the y-direction and the second plane travelling with this speed in the x-direction. The initial separation of the planes is 30.5 m. Find the time at which the separation of the planes is at its minimum.

1. A boy in a pedal car is moving at a speed of 1.40 m/s at...

1. A boy in a pedal car is moving at a speed of 1.40 m/s at the start of a 2.10 m high and 12.4 m long incline. The total mass is 54.5 kg, air resistance and rolling resistance can be modeled as a constant friction force of 41.0 N, and the speed at the lower end of the incline is 6.80 m/s. Determine the work done (in J) by the boy as the car travels down the incline. 2....

A car with mass 1309 kg is travelling north at a speed of 28.9 m/s. It...

A car with mass 1309 kg is travelling north at a speed of 28.9 m/s. It collides at right angles with a truck (m=2733 kg) travelling east at 16.6 m/s and the two vehicles stick together after the collision. How much kinetic energy is lost during the collision?

A 2.40-m-long pulse is travelling at a speed of 5.75 m/s in a spring. How long...

A 2.40-m-long pulse is travelling at a speed of 5.75 m/s in a spring. How long does it take the pulse to pass any point on the spring?

A billiard ball A moving at a speed of 2.4 m / s bumps into a...

A billiard ball A moving at a speed of 2.4 m / s bumps into a billiard ball B of the same mass, which are at rest. After the impact, A moves at a speed of 1.4 m / s in a direction that forms the angle 50 ◦ with A's original direction of movement. Determine the magnitude and direction of B's velocity vector by the impact. (Answer 1.8 m / s; 36 ◦)

1-A bullet moving horizontally with a speed of 600 m/s strikes a sandbag and continues for...

1-A bullet moving horizontally with a speed of 600 m/s strikes a sandbag and continues for a distance of 20 cm. A-What is the average acceleration of the bullet? B-How long does it take to come to rest? 2-A 45.0 kg skier, starting from rest, begins skiing straight down an incline on the mountain of 12.5. The coefficient of kinetic friction between skis and snow is 0.08. A-Draw a free body diagram of the skier and the forces acting on...

Suppose that each vehicle is initially moving at 7.0 m/s and that they undergo a perfectly...

Suppose that each vehicle is initially moving at 7.0 m/s and that they undergo a perfectly inelastic head on collision. Each driver has a mass of 80.0 kg. Including the drivers, the total vehicle masses are 800 kg for the car and 4000 kg for the truck. (a) if the collision time is 0.150 s, what average forces does the seatbelt exert on the truck driver? N (b)What average force does the seatbelt exert on the car driver? N

A 3-Kg toy car travelling initially with a speed of 20.0 m/s in the east direction...

A 3-Kg toy car travelling initially with a speed of 20.0 m/s in the east direction crashes into a 5.0 kg toy truck moving in the west direction 30.0m/s The velocity of the car right after the collision is 15.0m/s to the west. What is the velocity of the truck right after the collision.

A softball of mass 0.220 kg that is moving with a speed of 8.0 m/s (in...

A softball of mass 0.220 kg that is moving with a speed of 8.0 m/s (in the positive direction) collides head-on and elastically with another ball initially at rest. Afterward the incoming softball bounces backward with a speed of 6.4 m/s. (a) Calculate the velocity of the target ball after the collision. (b) Calculate the mass of the target ball

A truck with a mass of 1350 kg and moving with a speed of 12.0 m/s...

A truck with a mass of 1350 kg and moving with a speed of 12.0 m/s rear-ends a 821-kg car stopped at an intersection. The collision is approximately elastic since the car is in neutral, the brakes are off, the metal bumpers line up well and do not get damaged. Find the speed of both vehicles after the collision. vcar = ___________________ m/s vtruck = ____________________ m/s

Question