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
The ones that you buy at the store (that have C engines)
500 Ft and 2000 Ft for the other one
Posted in Model Rockets
Tagged maximum, maximum velocity, model, model rocket, Rocket, store, velocity
A lightning bug flies at a velocity of 0.25 m/s due east toward another lightning bug seen off in the distance. A light easterly breeze blows on the bug at a velocity of 0.25 m/s. What is the resultant velocity of the lightning bug?
0.00 m/s
0.25 m/s East
0.25 m/s West
0.5 m/s East
A jogger runs 10.0 blocks due east, 5.0 blocks due south, and another 2.0 blocks due east. Assume all blocks are of equal size. What is the magnitude of the jogger’s net displacement?
7.0 blocks
12.0 blocks
13.0 blocks
17.0 blocks
An airplane flying at 120 km/h due west moves into a region where the wind is blowing at 40 km/h due east. If the plane’s original vector velocity is Vplane, what is the expression for the plane’s resulting velocity in terms of Vplane?
Vplane
Vplane
1 Vplane
80 Vplane
A quarterback takes the ball from the line of scrimmage and runs backward for 10 m. He then runs sideways, parallel to the line of scrimmage for 15 m. Next, he throws the ball forward 50 m, perpendicular to the line of scrimmage. The receiver is tackled immediately. How far is the football displaced from its original position?
43 m
225 m
1,600 m
1,825 m
A duck waddles 2.5 m east and 6.0 m north. What are the magnitude and direction of the duck’s displacement with respect to its original position?
6.0 m at 50° north of east
42.25 m at 67° north of east
6.5 m at 23° north of east
6.5 m at 67° north of east
A fox sees a piece of carrion being thrown from a hawk’s nest and rushes to snatch it. The nest is 14.0 m high, and the carrion is thrown with a horizontal velocity of 1.5 m/s. The fox is 7.0 m from the base of the tree. What is the magnitude of the fox’s average velocity if it grabs the carrion in its mouth just as it touches the ground?
(Assume no air resistance and that ay = g = 9.81 m/s2.)
1.7 m/s
3.5 m/s
4.2 m/s
2.6 m/s
A cat pushes a ball from a 7.00 m high window, giving it a horizontal velocity of 0.20 m/s. How far from the base of the building does the ball land? (Assume no air resistance and that ay = g = 9.81 m/s2.)
0.24 m
1.4 m
7.0 m
7.2 m
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 from the edge of the cliff does the model rocket land? (Assume no air resistance and that ay = g = 9.81 m/s2.)
226 m
245 m
350 m
526 m
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?
83 s
125 s
200 s
208 s
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?
– 0.7 m/s
+ 1.3 m/s
– 0.3 m/s
+ 1.7 m/s
Posted in Model Rockets
Tagged breeze, breeze blows, bug, distance, due east, Light, Lightning, lightning bug, physics, resultant velocity, someone, velocity
a model rocket is lanched with an initial velocity of 180 ft per second. it’s height h, in feet, after t seconds is given….
h=180t – 16t^2….
how many seconds will the rocket first reach a height of 464 feet?
also, after how many seconds from launching will the rocket again be at that same height of 464 ft?
I really don’t know what “det” is…I really want to know how to do this…so if anyone could walk me through this step by step please…
Posted in Model Rockets
Tagged height, initial velocity, model, model rocket, Rocket, second, velocity
a model rocket is lanched with an initial velocity of 180 ft per second. it’s height h, in feet, after t seconds is given….
h=180t – 16t^2….
how many seconds will the rocket first reach a height of 464 feet?
also, after how many seconds from launching will the rocket again be at that same height of 464 ft?
what is det?
you lost me at det=45^2-4(4)(116)=169
by the way…the answers are in the book, we are not required to show our work, but I would still like to know how to do it.
Posted in Model Rockets
Tagged height, initial velocity, launch, model, model rocket, problem, question, Rocket, rocket launch, second, velocity
A model rocket is launched straight upward with an initial velocity of 22m/s. The height of the rocket , h, in metres, can be modelled by h(t)= -5t²+22t , where t is the elapsed time in seconds. What is the maximum height the rocket reaches?
Helppp me please! I cannot remember how to do this question and it is bothering me very much! Plus, it’s on my math summitive so basically I’m screwed if I can’t find a solution!
YAY 
Thanks guys!
You’re right 
Posted in Model Rockets
Tagged 5t, asap, height, initial velocity, max, max height, maximum, maximum height, model, model rocket, Quadratic, question, Rocket, time, velocity
What will the motion of a rocket near the Earth’s surface be like on a velocity vs. time graph. How can I model it?
Posted in Model Rockets
Tagged earth, graph, motion, Rocket, surface, time, time graph, velocity
