Space is different for different observers. Time is different for different observers. Spacetime is the same for everyone
Indicate whether the statement is true or false
TRUE
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A 1.6-kg ball is attached to the end of a 0.40-m string to form a pendulum. This pendulum is released from rest with the string horizontal. At the lowest point of its swing, when it is moving horizontally, the ball collides with a 0.80-kg block initially at rest on a horizontal frictionless surface. The speed of the block just after the collision is 3.0 m/s. What is the speed of the ball just
after the collision? a. 1.7 m/s b. 1.1 m/s c. 1.5 m/s d. 1.3 m/s e. 2.1 m/s
When a light beam enters glass from air the beam is refracted. Why does this happen? (Hint: What physical property of the light changes?)
Find the uncertainty in the momentum (in kg × m/s) of an electron if the uncertainty in its position is equal to 3.4 × 10^-10 m, the circumference of the first Bohr orbit
a. 6.2 × 10^-25 b. 1.6 × 10^-25 c. 15.5 × 10^-25 d. 19.4 × 10^-25 e. 2.0 × 10^-24
Which of the following types of galaxies are closest to being spherical in shape?
A) spirals B) ellipticals C) irregulars