# Physics

A rocket-powered hockey puck moves on a horizontal frictionless table. The figure below shows the graphs of vx and vy, the x- and y-components of the puck’s velocity. The puck starts at the origin.

The graph of the X-velocity is v=8t cm/s and the Y-velocity is V=30cm/s

Part A
In which direction is the puck moving at t = 2 s ? Give your answer as an angle from the x-axis.

Part B
How far from the origin is the puck at 3 s ?
Express your answer to two significant figures and include the appropriate units.

1. 👍 1
2. 👎 2
3. 👁 8,573
1. A. X = 8*2 = 16 cm/s. Y = 30 cm/s.
Tan A = Y/X = 30/16 = 1.875.
A = 61.9o

B. X = 8*3 = 24 cm/s. Y = 30 cm/s.
Dx = 24cm/s * 3s = 72 cm.
Dy = 30cm/s * 3s = 90 cm.

D = sqrt(Dx^2 + Dy^2) =

1. 👍 3
2. 👎 24
2. 115.256 cm

1. 👍 0
2. 👎 10
3. B. X = (1/2)(a)(t)^2 = (1/2)(8)(3)^2 = 36 cm
Y = (v(0))(t) = (30)(3) = 90cm
D = sqrt(x^2+y^2) = sqrt(36^2+90^2) = sqrt(9396)

~ 97 cm

1. 👍 4
2. 👎 3
4. I don't know

1. 👍 0
2. 👎 3

## Similar Questions

1. ### Physics

a person pushes on a hockey puck with their stick at an angle so the vertical force is 22N down and the horizontal force is 45N forward. Assume the ice is frictionless. What is the actual force the hockey player transmits to the

asked by Anonymous on May 29, 2014
2. ### physics

EXERCISE 4.9 (a) Suppose a hockey puck slides down a frictionless ramp with an acceleration of 5.00 m/s2. What angle does the ramp make with respect to the horizontal? (b) If the ramp has a length of 6.00 m, how long does it take

asked by hisham on November 15, 2012
3. ### Physics

The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.025 kg and is moving along the x axis with a velocity of +5.5 m/s. It makes a collision with puck B, which has a mass of 0.060 kg and

asked by Sam on October 23, 2012
4. ### College Physics

A hockey puck B rests on frictionless, level ice and is struck by a second puck A, which was originally traveling at 40.0 m/s and which is deflected 30 degrees from its original direction. Puck B acquires a velocity at a -45

asked by Anonymous on June 13, 2010
1. ### Physics

On a frictionless, horizontal air table, puck A (with mass 0.25kg) is moving toward puck B (with mass 0.35kg), which is initially at rest.After the collision,puck A has a velocity of 0.12m/s to the left, and puck B has a velocity

asked by Zairah on May 20, 2019
2. ### Physics

A rocket-powered hockey puck has a thrust of 2.20 newtons and a total mass of 0.700 kilograms . It is released from rest on a frictionless table, 2.90 meters from the edge of a 2.80 meter drop. The front of the rocket is pointed

asked by Steve on September 30, 2011
3. ### physics

A puck on a horizontal, frictionless surface is attached to a string that wraps around a pole of finite radius, as shown in the figure . As the puck moves along the spiral path, does its speed increase, decrease, or stay the same?

asked by Patrick on January 22, 2012
4. ### physics Work unit

1. A football player pushes a tackle dummy forwards at a constant 0.85m/s for 11m using 7150J of energy. The tackling dummy mass is 120kg. a) find force the player exerts? b) what is the frictional force the dummy exerts? c) what

asked by Jamie on February 1, 2014
1. ### Physics

two identical pucks collide on an air hockey table. one puck was originally at rest. if the incoming puck has a speed of 6 m/s and scatters to an angle of 30 degree, what is the velocity (magnitude and direction) of the second

asked by Zac Berlin on August 21, 2019
2. ### physics

A 98.0 kg ice hockey player hits a 0.150 kg puck, giving the puck a velocity of 49.5 m/s. If both are initially at rest and if the ice is frictionless, how far does the player recoil in the time it takes the puck to reach the goal

asked by alex on February 3, 2015
3. ### physics 2

Question 1: Suppose a child of weight w climbs onto the sled. If the tension force is measured to be 58.5 N, find the weight of the child and the magnitude of the normal force acting on the sled. Question 2 : (a) Suppose a hockey

asked by Michelle J on October 5, 2019
4. ### physics

An air puck of mass m1 = 0.24 kg is tied to a string and allowed to revolve in a circle of radius R = 1.4 m on a frictionless horizontal table. The other end of the string passes through a hole in the center of the table, and a

asked by maryann on March 27, 2016