When parked, your car is 5.2 m long. Unfortunately, your garage is only 3.9 m long.
Part A: How fast would your car have to be moving for an observer on the ground to find your car shorter than your garage?
Part B: When you are driving at this speed, how long is your garage, as measured in the car's frame of reference?
When parked, your car is 5.2 m long. Unfortunately, your garage is only 3.9 m long....
When parked, your car is 6.4 m long. Unfortunately, your garage is only 3.9 m long. How fast would your car have to be moving for an observer on the ground to find your car shorter than your garage? Express your answer using two significant figures. Part B When you are driving at this speed, how long is your garage, as measured in the car's frame of reference? Express your answer using two significant figures.
Problem 7-C: The aerodynamic drag of a new sports car is to be predicted at a speed of 70.0 mi/h at an air temperature of 25°C. Automotive engineers build a one-fourth scale model of the car to test in a wind tunnel. The temperature of the wind tunnel air is also 25°C. The drag force is measured with a drag balance, and the moving belt is used to simulate the moving ground (from the car's frame of reference) Determine how...
A car is parked 20.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, headed directly east at a speed of 55.5 m/s. The train sounds a short blast of its 312-Hz horn when it reaches a point 20.0 m west of the crossing. What frequency does the car's driver hear when the horn blast reaches the car? The speed of sound in air is 343 m/s. (Hint: Assume that only the component...
A 3900 kg car is parked at the top of an 8.7 m long driveway that is sloped at 17? with the horizontal. The parking brake fails. If an average friction force of 4200 N im- pedes the motion, find the speed of the car at the bottom of the driveway. The acceleration of gravity is 9.8 m/s2 . Starting from rest, a 10.0 kg suitcase slides 3.00 m down a frictionless ramp inclined at 31.0? from the floor. The...
9.1 Lorentz Contraction Objects traveling at relativistic speeds will appear to a stationary observer as shorter, as- suming that it is parallel to the direction of its motion. Using the equation for Lorentz contraction, find the following, where c is the speed of light: a) A spaceship is traveling with a velocity 0.8c. If it is 200m long in its rest frame (when the object is not moving), how long do you observe it to be? Assume that you can...
Objects traveling at relativistic speeds will appear to a stationary observer as shorter, as- suming that it is parallel to the direction of its motion. Using the equation for Lorentz contraction, find the following, where c is the speed of light: a) A spaceship is traveling with a velocity 0.8c. If it is 200m long in its rest frame (when the object is not moving), how long do you observe it to be? Assume that you can see the entire...
Which of the following statements are IMPOSSIBLE? Choose all that apply. The rocket's speed was measured to be 0.65c. The rocket's rest length is 300 m. An observer flying by measured the rocket to be 321 m long. A rocket flying away from the Sun at 0.78c measured the speed of the photons (particles of light) emitted by the Sun to be c. An inertial reference frame had an acceleration of 0 m/s2.The proper time interval between two events was...
A football quarterback is moving straight backward at a speed of 3.9 m/s when he throws a pass to a player 15m (10%) Problem 9: straight downfield 33% Part (a) If the ball is thrown at an angle of 25. relative to the ground and is caught at the same height as it is released, what is its initial speed relative to the ground in m/s? її 33% Part (b) How long does it take to get to the receiver...
Practice Problem 27.3 SOLUTION A spaceship flies past earth with a speed of 0.980c (about 2.97 x 10 m/s) relative to earth. A crew member on the spaceship measures its length, obtaining the value 400 m. What is the length measured by observers on earth? SET UP The length of the spaceship in the frame in which it is at rest (400 m) is a proper length in this frame, corresponding to lo in We want to find the length...
Relativistic Length Measurements 4.7. Compute the contraction in length of a train 1/2 mile long when it is traveling at 100 mi/hr. Ans. 5.58 x 10-15 mi = 3.52 x 10-10 in. 4.8. At what speed must an observer move past the earth so that the earth appears like an ellipse whose major axis is six times its minor axis? Ans. 0.986c 49. An observer O' holds a 1.00 m stick at an angle of 30° with respect to the...