Question

Can someone help me with these practice problems? need urgent

1. Time is a. dependent on the observer d. simultaneous in all cases b. absolute e. never changing c. the same for different observers 2. Newtonian mechanics are valid a. in all frames of reference d. on Earth only b. in relativistic frames of reference e. both b and c c. in inertial frames of reference 3. A beam of light is shone forward from a moving vehicle. The speed of light leaving the vehicle will be a. dependent on the speed of the vehicle b. the addition of the speed of light plus the speed of the vehicle c. constant at the speed of light d. slower so that the addition of the vehicle's speed corrects it e. none of the above 4. As an object approaches the speed of light, the relativistic momentum of the object a. will increase, depending on velocity d. cannot be determined separately b. will decrease, depending on velocity e. none of the above c. will not change 5. A scientist in a very fast spaceship wants to do an experiment to determine whether he is moving. Which quantity can be measured to find out whether the scientist is moving or at rest? a. Time can be measured accurately. b. Length can be measured accurately. c. Time and length can be measured together. d. An object can be observed going by the window. e. Nothing can be measured which would indicate this. 6. A computer can make a calculation in 0.25 us. If the computer is in a ship moving at 0.95c, how long will each calculation take relative to Earth? a. 0.80 Ls d. 0.18 us b. 0.24 us e. 0.08 Ls c. 0.26 us 7. Mission control would like an cosmonaut to check her heart rate. She is flying at 0.50c. If a normal heart rate is 72 beats/min, what would a normal heart rate appear to be for the cosmonaut? a. 288 beats/min d. 72 beats/min b. 62 beats/min e. 18 beats/min c. 83 beats/min 8. The equation E=mc illustrates that a. travelling at the speed of light converts matter into energy b. rest mass and energy are equivalent c. energy can be converted into mass d. matter can be converted into energy e. both b and d

Answer 1

1) Time can never be absolute and it is different for different observers. It is also changing every moment. So, time is:

(a) Dependent on the observer

2) An inertial frame of reference is one in which Newton's Laws of motion are valid. So, Newtonian mechanics are valid:

(c) in inertial frames of reference