A 500g model rocket is resting horizontally at the top edge of a 40m high wall when it is accidentally bumped. The bump pushes it off the edge with a horizontal speed of 0.5m/s and at the same time causes the engine to ignite. When the engine fires, it exerts a constant 20N horizontal thrust away from the wall.
a) How far from the base of the wall does the rocket land?
b) Describe the trajectory of the rocket while it travels to the ground.
Posted in Model Rockets
Tagged 5m, bump, edge, Engine, engine fires, horizontal, horizontal speed, horizontal thrust, model, model rocket, motion, motion problem, problem, Rocket, speed, top edge, wall
As a science fair project, you want to launch an 850 g model rocket straight up and hit a horizontally moving target as it passes 31 m above the launch point. The rocket engine provides a constant thrust of 15.0 N. The target is approaching at a speed of 15 m/s. At what horizontal distance between the target and the rocket should you launch?
I was trying to use some of the kinematic equations to figure this one out, but I’m always missing some part to the problem or at least that’s what I’m thinking. Got any ideas?
Posted in Model Rockets
Tagged distance, Engine, horizontal, launch, launch point, model, model rocket, moving target, N. The, point, project, Rocket, rocket engine, Science, science fair project, target, thrust
1. A worker pulls a sled with a force of 80 N directed at an angle of 60 degrees above the horizontal over a level distance of 6 m. If a frictional force of 24 N acts on the sled in a direction opposite to that of the worker, what net work is done on the sled?
a. 240 J, b. 216 J, c. 144 J, d. 96 J
2. A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:
a. momentum is conserved in this process
b. the fuel pushes on the ground
c. air friction pushes on the escaping fuel
d. the downward force of gravity is less than the downward momentum of the fuel
please explain why you believe the answers are what they are just in case yours are different than mine. thanks a lot guys!
3. A 10 g bullet with an initial speed of 100 m/s is fired horizontally into a 90 g wodden block initially at rest on a frictionless horizontal surface. The bullet passes completely through the block and emerges with a final speed of 20 m/s in the horizontal direction. How much mechanical energy is lost in this process?
a. 44.4 J
b. 50 J
c. 26.4 J
d. 20 J
Posted in Model Rockets
Tagged acts, angle, direction, distance, Force, frictional, frictional force, horizontal, level, sled, work, worker
1. A worker pulls a sled with a force of 80 N directed at an angle of 60 degrees above the horizontal over a level distance of 6 m. If a frictional force of 24 N acts on the sled in a direction opposite to that of the worker, what net work is done on the sled?
a. 240 J, b. 216 J, c. 144 J, d. 96 J
2. A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:
a. momentum is conserved in this process
b. the fuel pushes on the ground
c. air friction pushes on the escaping fuel
d. the downward force of gravity is less than the downward momentum of the fuel
please explain why you believe the answers are what they are just in case yours are different than mine. thanks a lot guys!
3. A 10 g bullet with an initial speed of 100 m/s is fired horizontally into a 90 g wodden block initially at rest on a frictionless horizontal surface. The bullet passes completely through the block and emerges with a final speed of 20 m/s in the horizontal direction. How much mechanical energy is lost in this process?
a. 44.4 J
b. 50 J
c. 26.4 J
d. 20 J
Posted in Model Rockets
Tagged acts, angle, check, direction, distance, Force, frictional, frictional force, horizontal, level, physics, physics problems, sled, worker
To model a spacecraft, a toy engine is securely fastened to a large puck, which can glide with negligible friction over a horizontal furface, taken as teh xy plane. The 7.0kg puck has a velocity of 2.00i m/s at one instant. Eight seconds later, its velocity is to be (5.00i + 7.00j)m/s. Assuming the rocket engine exerts a constant total horizontal force, find the components of the force. Find its magniutde.
Posted in Model Rockets
Tagged 00i, 00j, eight seconds, Engine, first and second law, Force, friction, horizontal, horizontal force, law, magintude, newtons, puck, rocket engine, spacecraft, Toy, velocity, xy plane
To model a spacecraft, a toy rocket engine is securely fastened to a large puck, which can glide with negligible friction over a horizontal surface, taken as the xy plane. The 10.0 kg puck has a velocity of 5.00 i m/s at one instant. Eight seconds later, its velocity is to be (3.00 i + 9.00 j) m/s.
a) Assuming the rocket engine exerts a constant total horizontal force, find the components of the force (i and j)
b) Find its magnitude.
Posted in Model Rockets
Tagged eight seconds, Engine, friction, horizontal, horizontal surface, laws of motion, motion, newton, puck, Rocket, rocket engine, spacecraft, Toy, velocity, xy plane
1) A model rocket flies horizontally off the edge of a cliff at a velocity of 50.0 m/s. If the canyon below is 100.0 m deep, how far in the horizontal direction does the rocket travel from the edge of the cliff? (Assume no air resistance and that ay= g = 9.81 m/s2.)
a) 226 m
b) 245 m
c) 350 m
d) 526 m
2) A boat moves at 10.00 m/s relative to the water. If the boat is in a river where the current is 2.00 m/s, how long does it take the boat to make a complete round trip of 1,000.0 m upstream followed by 1,000.0 m downstream?
a) 83 s
b) 125 s
c) 200 s
d) 208 s
3) A person is strolling along a moving walkway at a constant velocity of +1.00 m/s with respect to the walkway, which moves at a constant velocity of +0.50 m/s with respect to the ground. An observer on the ground is walking at a constant velocity of -0.2 m/s. What is the velocity of the person on the walkway with respect to the observer on the ground?
a) – 0.7 m/s
b) + 1.3 m/s
c) – 0.3 m/s
d) + 1.7 m/s
Posted in Model Rockets
Tagged air resistance, Canyon, cliff, edge, horizontal, horizontal direction, model, model rocket, physics, plz, Rocket, s2, stuff, velocity
