Bob is moving away from Alice with speed of 0.5c. Carlos is moving away from Alice and perpendicular to Bob with speed of 0.8 c. What is the speed of Carlos as measured by Alice?
As Carlos is moving with 0.8c with respect to Alice, then then the speed of Carlos measured by Alice is 0.8c.
Bob is moving away from Alice with speed of 0.5c. Carlos is moving away from Alice...
Alice G LOO Bob Let's revisit the simultaneity problem from worksheet 11. To make things concrete, we'll include specific numbers. Bob is standing on the ground watching Alice go by in a high-speed train. As seen in Bob's reference frame, Alice is traveling to the right at speed v = +0.80c. As measured in Bob's frame, Alice's rail car is 12 m long. Alice is sitting in the exact center of the train car. At the instant that the Alice...
n11. A spaceship is moving away from an asteroid with a speed of 0.80c relative to the aster- oid. The spaceship then fires a missile with a speed of 0.50c relative to the spaceship. What is the speed of the missile measured bv astronauts on the asteroid if the missile is fired on e lozt Choose one: a) 0.30c 50c c) 0.93c Cr messle e) 0.65c 2 2 2.0 n11. A spaceship is moving away from an asteroid with a...
My Note A spaceship is moving at a speed ot 0.9c away from an observer at rest. A boy in the spaceship shoots a proton gun with protons having a speed of 0.2c. (a) What is the speed of the protons measured by the observer at rest when the gun is shot away from the observer? (b) What is the speed of the protons measured by the observer at rest when the gun is shot toward the observer? O Type...
1. Amanda is running with a clock at 0.5c (c being the speed of light). To someone standing still (Bob) 10 minutes pass. How much time passes on Amanda's clock from Bob's point of view? The Bob is also holding a clock. If Amanda's clock says 15 minutes have passed, how much time passes on Bob's clock from Amanda's point of view? 2·
2. Alice and Bob are swimming in a river. They start together at the same point on the bank of a wide stream that flows with a speed v. Both move at the same speed c where c> v) relative to the water. Alice swims downstream a distance L and then upstream the same distance. Bob swims so that his motion relative to the Earth is perpendicular to the banks of the stream. He swims the distance L and then...
Suppose that Bob receives a PGP message from Alice. How does Bob know for sure that Alice created the message?
(b) Alice is at the centre of a merry-go-round (carousel) of radius R. Bob watches from the side while Alice rotates on the merry-go-round. Alice throws a ball of mass m radially outwards with speed v, while she rotates with constant angular velocity w. Alice and Bob talk afterwards and she tells him how she saw the ball be deflected to the side, as if it were acted upon by some force. Help Bob explain this inertial force to Alice...
2. Alice and Bob are swimming in a river. They start together at the same point on the bank of a wide strcam that flows with a speed v. Both move at the same speed c (where c > v) relative to the water. Alice swims downstream a distance L and then upstream the same distance. Bob swims so that his motion relative to the Earth is perpendicular to the banks of the stream. He swims the distance L and...
2. Alice and Bob are swimming in a river. They start together at the same point on the bank of a wide strcam that flows with a speed v. Both move at the same speed c (where c > v) relative to the water. Alice swims downstream a distance L and then upstream the same distance. Bob swims so that his motion relative to the Earth is perpendicular to the banks of the stream. He swims the distance L and...
Alice wants to send a message m to Bob using Rabin Cryptosystem. Bob makes the public key n = 77 and sends it to Alice. By using Rabin Cryptosystem, a) Alice encrypts her message m and sends the encrypted message c to Bob. What are the encrypted messages if m = 8, 36, 41 and 69? b) Alice encrypts her message m = 6 and sends the encrypted message c to Bob. Bob decrypts the message. What are the possible...