
william is building A contraption for a competition which launch is a straight up in the...
Colby participates in a rocket-launch competition in her high school. The goal is to launch a rocket with mass m = 2.3 kg [5 lbs] to a height no less than 50-m (164 ft) above ground. a) What is the minimum momentum of the rocket as it leaves the launch pad? b) Colby figured out three possible propulsion mechanisms that differ by the generated force F (“thrust”) and the time interval ∆t during which the force acts on the rocket...
(10 marks) A small catapult is used to launch 1.5 kg water balloons straight up into the air. A clever student is able to measure the speed of the water balloon while it is rising up into the air. She finds that the water balloon is 8.0 m above the catapult it is moving at a speed of 20.0 m/s. (For the purposes of this question, assume that the catapult is positioned in a small hole so that the height...
(10 marks) A small catapult is used to launch 1.5 kg water balloons straight up into the air. A clever student is able to measure the speed of the water balloon while it is rising up into the air. She finds that the water balloon is 8.0 m above the catapult it is moving at a speed of 20.0 m/s. (For the purposes of this question, assume that the catapult is positioned in a small hole so that the height...
1) A projectile of mass 1.400 kg is shot straight up with an initial speed of 27.0 m/s. (b) If the projectile rises to a maximum height of only 27.2 m, determine the magnitude of the average force due to air resistance. _______ N
A projectile of mass 1.400 kg is shot straight up with an initial speed of 27.0 m/s. (a) How high would it go if there were no air resistance? m (b) If the projectile rises to a maximum height of only 27.2 m, determine the magnitude of the average force due to air resistance. N
A student with a mass of 50.1 kg jumps straight up in the air by using her legs to apply an average force of 847 N to the ground for 0.389 s. Assume that the initial momentum of the student and the Earth are zero. (The mass of the Earth is 5.98·1024 kg.) What is the momentum of the student immediately after this impulse? (Convention: upwards is positive and downwards is negative.) What is the momentum of the Earth after...
A student with a mass of 58.1 kg jumps straight up in the air by using her legs to apply an average force of 813 N to the ground for 0.265 s. Assume that the initial momentum of the student and the Earth are zero. (The mass of the Earth is 5.98·1024 kg.) a) What is the momentum of the student immediately after this impulse? (Convention: upwards is positive and downwards is negative.) b) What is the momentum of the...
A 15 meter long, vertical cannon is used to accelerate a 1.5 kg ball straight up into the air. A constant force of 18.5 N is used to accelerate the ball up the length of the cannon. a. What is the ball's velocity as it leaves the cannon? (assume no energy loss to 9. friction) What would the ball's velocity be as it leaves the cannon if there was a 10% energy loss due to friction while the ball was...
The figure below shows the speed of a person's body as he does a
chin-up. Assume the motion is vertical and the mass of the person's
body is 57.4 kg. Determine the force exerted by the chin-up bar on
his body at the following times.
(a) t = 0
N
(b) t = 0.5 s
N
(c) t = 1.1 s
N
(d) t = 1.6 s.
N
30 20 ˋ毛多 100 0.5 1.5 2.0 time (s)
1. A ball is thrown straight up with an initial speed of 30 m/s. How much time does it take for the ball to reach the top of it's trajectory? 2. For 3.0s, Allison exerts a net force of 10.0 N on a 6.7-kg shopping cart that was initially at rest. Find the acceleration of the cart, and show that it moves a distance of 6.7m. 3. Suzie skydiver with her parachute has a mass of 50 kg. Before opening...