PHYS211_checkpoint3

mechanis

Amelia and Jack are the only observers in a Newtonian universe. Which of these scenarios describes both observers in an inertial reference frame? I - Amelia moves at a constant speed around a stationary Jack. II- Amelia moves in a straight line and at a constant speed toward a stationary Jack. III-Amelia and Jack move toward each other in a straight line and at constant speeds. A.)III only B.)II only C.)II and III only D.)I and II only

Consider a Newtonian universe where the only observers are A and B. Which of these scenario/s describe both observers in an inertial reference frame? I. A moves at a constant speed around a stationary B. II. A moves in a straight line and at a constant speed toward a stationary B. III. A and B move toward each other in a straight line and at constant speeds.

An object is dropped from a vertical distance of 50m above the ground and it takes 3.19sec to fall that distance. A second identical object to launched from the same height, with a horizontal velocity of 45.9 m/s.  How long does the second object take to fall 50m ? a) Much less than 3.19 sec b) More than 3.19 sec c) Almost 3.19 sec d) Exactly 3.19 sec  e) Less than 3.19 sec

A train is travelling with constant velocity 5 [km/h] East relative to a train station, while Rick is walking with constant velocity 5 [km/h] relative the train station heading West. Morty is sitting still on a bench on the station waiting for Rick. Which of the following statements about their relative velocities is TRUE? A. The train is stationary relative to Rick. B. The train is moving faster relative to Morty than it is moving relative to Rick. C. Relative to the train, Morty is moving with same velocity as the train station. D. Relative to Morty, Rick is moving with the same velocity as the train.

6. [#265] Hockey A (field) hockey player is running north at a speed of 8 m •s. A ball is coming directly towards her from the north at a speed of 18 m- s. She swings her stick forward, directly north, at a speed of 6 m · s measured in her own frame of reference. What is the speed of the ball with respect to the hockey stick? Relative to the hockey stick, the ball is travelling at m·s l Enter answer here P Type here to search 932 am 29°C Haze AG D A d ENG 06/12/2021 FULL HD 1080 acer FB F11 Pause Be Delene Esc 崇 23 2$ € 8 1 2 3 W E T Y Q 4 Tab DI K F Caps Lock V レン

ct S a b World line of Enterprise Star A star is about to go supernova (explode) and a planet orbiting the star must be evacuated. The starship Enterprise is sent to the planet to assist in the evacuation. The world lines of the Enterprise, the star, and the planet are shown on the space-time diagram below. Assume that the planet and star are at rest relative to each other. The plan is for the Enterprise to fly by the planet at a constant velocity and beam up the inhabitants without stopping. The star explodes at space-time point s and light from the explosion spreads out in all directions, including those shown on the diagram. Use the diagram to answer the following questions. a) At which of the points labeled a through h in the space-time diagram does the Enterprise arrive at the planet? b) In the reference frame of the Enterprise, at which point is the star when the Enterprise arrives at the planet? c) In the reference frame of the Enterprise, does the Enterprise arrive at the…

10

Urgent

Special Relativity 4.2 O Starship A moves away from Earth with a speed of va/e = 0.8. Starship B moves away from Earth in the opposite direction with a speed of vg/c = 0.6. What is the speed of starship A as measured by starship B? What is the speed of starship B as measured by starship A?

KINEMATICS OF PARTICLE AND RIGID BODIES 1.) A race car accelerates uniformly from 18.5m/sec to 46.1m/sec in 2.47sec. Determine the acceleration of the car and the total distance traveled for the period.

Number 8 please :)

6

A train is traveling along a straight, horizontal track at a constant speed that is only slightly less than that of light. An observer in the train determines that firecrackers go off simultaneously in the engine and in the caboose. An observer on the ground determines that the firecracker in the ____ went off first. A)They went off simultaneously for both observers. B)caboose  C)engine

2) An astronaut who is 6 ft high on the earth, lying parallel to the axis of a spacecraft moving at a speed of 0.9 relative to the earth. How tall is the astronaut when measured in the plane? a. 9 ft b. 6 ft c. 3 ft d. nothing is right

Just the relative motion question

What are the postulates of special relativity? Select all those apply. the laws of physics are the same in all inertial frames of reference. I. II. the speed of light is the same in any frame of reference. III. the length of an object depends on its speed relative to a given observer. IV. all physical experiments conducted in an accelerated frame of reference give identical results. Answer choices: A. I, II, and IV B. I and II C. II and III D. All of the above E. None of the above

AE 5m XI -5 m 5 m FIG. 2.10 A spacetime diagram showing the worldlines of various particles. P2.1 The spacetime diagram in figure 2.10 shows the worldlines of various particles moving along the x axis in space. Note that (as is conventional in spacetime dia- grams), I have calibrated the r and x axes in this diagram. to have the same scales in the same units: this ensures that the worldline of a photon (which has a speed of 1) makes a 45° angle with each axis. For each labeled world- line, describe (1) where the particle is at time t = 0, (2) about how fast and in what direction (in the +x direction or the-x direction) the particle is moving at that time, and (3) whether the particle's speed subsequently increases or decreases as time passes. Also identify the one worldline that is physically impossible, and explain why.

How to solve this question

1- A ball is thrown at 20.0 m/s inside a boxcar moving along the tracks at 40.0 m/s. What is the speed of the ball relative to the ground if the ball is thrown (a) forward (b) backward (c) out the side door

1q

KINEMATIC RECTILINEAR MOTION 1. Cars A and B are traveling in the same direction at the same speed of 25 kph along a level road with Car A 100 meters ahead of car B. Car A decelerate at 2 m/sec?. From this instance up to the time Car B overtakes (meets) Car A, how far Car A has traveled?

5. Describe the motion of each of the following examples if they are observed from the stated frame of reference: a) A person standing on a platform viewed from a train traveling North b) A ball dropped by a boy walking at a velocity of 1m/s viewed by the boy c) A ball dropped by a boy walking at a velocity of 1 m/s as seen by a nearby viewer who is stationary