A rocket ship flies past the earth at 91.0% of the speed of light . Inside, an astronaut who is undergoing a physical examination is having his height measured while he is lying down parallel to the direction in which the ship is moving. (a) If his height is measured to be 2.00 m by his doctor inside the ship, what height would a person watching this from the earth measure? (b) If the earth-based person had measured 2.00 m, what would the doctor in the spaceship have measured for the astronaut’s height? Is this a reasonable height? (c) Suppose the astronaut in part (a) gets up after the examination and stands with his body perpendicular to the direction of motion. What would the doctor in the rocket and the observer on earth measure for his height now?
A rocket ship flies past the earth at 91.0% of the speed of light . Inside, an astronaut who is undergoing a physical examination is having his height measured while he is lying down parallel to the direction in which the ship is moving. (a) If his height is measured to be 2.00 m by his doctor inside the ship, what height would a person watching this from the earth measure? (b) If the earth-based person had measured 2.00 m, what would the doctor in the spaceship have measured for the astronaut’s height? Is this a reasonable height? (c) Suppose the astronaut in part (a) gets up after the examination and stands with his body perpendicular to the direction of motion. What would the doctor in the rocket and the observer on earth measure for his height now?
A rocket ship flies past the earth at 91.0% of the speed of light. Inside, an astronaut who is undergoing a physical examination is having his height measured while he is lying down parallel to the direction in which the ship is moving. (a) If his height is measured to be 2.00 m by his doctor inside the ship, what height would a person watching this from the earth measure? (b) If the earth-based person had measured 2.00 m, what would the doctor in the spaceship have measured for the astronaut’s height? Is this a reasonable height? (c) Suppose the astronaut in part (a) gets up after the examination and stands with his body perpendicular to the direction of motion. What would the doctor in the rocket and the observer on earth measure for his height now?
Definition Definition Rate at which light travels, measured in a vacuum. The speed of light is a universal physical constant used in many areas of physics, most commonly denoted by the letter c . The value of the speed of light c = 299,792,458 m/s, but for most of the calculations, the value of the speed of light is approximated as c = 3 x 10 8 m/s.
4.56 ... CALC An object of mass m is at rest in equilibrium at the
origin. At t = 0 a new force F(t) is applied that has components
Fx(t) = k₁ + k₂y
Fy(t) = k3t
where k₁, k2, and k3 are constants. Calculate the position (1) and veloc-
ity (t) vectors as functions of time.
4.14 ⚫ A 2.75 kg cat moves in a
straight line (the x-axis). Figure
E4.14 shows a graph of the x-
component of this cat's velocity
as a function of time. (a) Find the
maximum net force on this cat.
When does this force occur? (b)
When is the net force on the cat
equal to zero? (c) What is the net
force at time 8.5 s?
Figure E4.14
V₁ (m/s)
12.0
10.0
8.0
6.0
4.0
2.0
0
t(s)
2.0 4.0 6.0 8.0 10.0
4.36 ... CP An advertisement claims that a particular automobile can
"stop on a dime." What net force would be necessary to stop a 850 kg
automobile traveling initially at 45.0 km/h in a distance equal to the di-
ameter of a dime, 1.8 cm?
Chapter 37 Solutions
University Physics with Modern Physics, Volume 2 (Chs. 21-37); Mastering Physics with Pearson eText -- ValuePack Access Card (14th Edition)
Chemistry: An Introduction to General, Organic, and Biological Chemistry (13th Edition)
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