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# Dale & Joyce

• ### When aimed at an elevation of 45 degrees, the German cannon Big Bertha was capable of shooting projectiles over a distance of 80.0 miles. ?

When aimed at an elevation of 45 degrees, the German cannon Big Bertha was capable of shooting projectiles over a distance of 80.0 miles. Assuming the projectiles hit with the same vertical speed they had when projected, find

a. the initial speed of the projectiles and

b. the time of flight.

• ### A projectile is moving in two dimensions. ?

A projectile is moving in two dimensions. When it reaches its maximum height, what is the value of the vertical component of its velocity?

• ### a military rocket is equipped with thruster engines that allow it to navigate towards its target. ?

A military rocket is equipped with thruster engines that allow it to navigate towards its target. These thrusters fight gravity so that the vertical acceleration the projectile experiences is greatly reduced. In addition, the thrusters allow the rocket to accelerate horizontally. Do you expect this rocket to travel on a parabolic path? Why or why not?

Physics7 months ago
• ### A bullet is fired at a target, which is at the same height as the gun?

A bullet is fired at a target, which is at the same height as the gun from which the bullet was fired. If the bullet takes 0.68 sec to hit the target, how long did it take for the bullet to reach its maximum height?

• ### Last year, a jogger decided to gradually increase the distance she ran. ?

Last year, a jogger decided to gradually increase the distance she ran. In the first week of her new program, she jogged 5 km, and each week thereafter she increased the distance by 7% over the distance she jogged the previous week. She maintained the program faithfully for a full year. To the nearest kilometer, what total distance did she jog during the year? Please help!

• ### Two toy cars (m1 = 0.200 kg and m2 = 0.250 kg) are held together rear to rear with a compressed spring?

Two toy cars (m1 = 0.200 kg and m2 = 0.250 kg) are held together rear to rear with a compressed spring between them. What is the velocity of the 2nd car if, when the spring is released, the first car obtains a speed of 5.00 m/s? Assume the spring adds no mass to the two cars.

• ### A child shoves a 1.3 kg block?

A child shoves a 1.3 kg block so that it starts traveling across a level floor with an initial velocity of 2.1 m/s. If the coefficient of kinetic friction between the block and the floor is 0.37, how far will it travel before coming to rest?

• ### A bicyclist travels up a 12.6 m hill?

A bicyclist travels up a 12.6 m hill and reaches the top with a speed of 8.5 m/sec. At that point, the bicyclist stops pedaling and coasts down the hill and up the next one. If the next hill is 1.8 m high, how fast will the bicyclist be traveling when it reaches the top of the second hill? The combined mass of the bicycle and cyclists is 96 kg.

• ### A machine must move an object 25.7 m?

A machine must move an object 25.7 m by exerting a 50.0 N force. If the machine provides a power of 21.4 W, how long does it take the machine to get the job done?

• ### suppose the frictional energy of a 1.5 kg box sliding down a 2.0 m ramp?

suppose the frictional energy of a 1.5 kg box sliding down a 2.0 m ramp could be harnessed to burn a 60.0 Watt light bulb. How long could this lightbulb burn if the box reaches a speed of 2.0 m/s at the bottom of the ramp?