(a) The Sun orbits the Milky Way galaxy once each 2.60 × 10 8 y, with a roughly circular orbit averaging 3.00 × 10 4 light years in radius. (A light year is the distance traveled by light in 1 y.) Calculate the centripetal acceleration of the Sun in its galactic orbit. Does your result support the contention that a nearly inertial frame of reference can be located at the Sun? (b) Calculate the average speed of the Sun in its galactic orbit. Does the answer surprise you?
(a) The Sun orbits the Milky Way galaxy once each 2.60 × 10 8 y, with a roughly circular orbit averaging 3.00 × 10 4 light years in radius. (A light year is the distance traveled by light in 1 y.) Calculate the centripetal acceleration of the Sun in its galactic orbit. Does your result support the contention that a nearly inertial frame of reference can be located at the Sun? (b) Calculate the average speed of the Sun in its galactic orbit. Does the answer surprise you?
(a) The Sun orbits the Milky Way galaxy once each
2.60
×
10
8
y, with a roughly circular orbit averaging
3.00
×
10
4
light years in radius. (A light year is the distance traveled by light in 1 y.) Calculate the centripetal acceleration of the Sun in its galactic orbit. Does your result support the contention that a nearly inertial frame of reference can be located at the Sun?
(b) Calculate the average speed of the Sun in its galactic orbit. Does the answer surprise you?
Three objects with masses m₁ = 3.8 kg, m₂ = 12 kg, and m 19 kg, respectively, are attached by strings over frictionless pulleys as indicated in the figure below. The horizontal surface exerts a force of friction of 30 N on m2. If the system is released from rest, use energy concepts to
find the speed of m¸ after it moves down 4.0 m.
m/s
m
m2
mg
In order for Jane to return to base camp, she needs to swing across a river of width D that is filled with alligators. She must swing into a wind exerting constant horizontal force F,
F = 110 N, L = 40.0 m, 0 = 50.0°, and her mass to be 50.0 kg.
Wind
→F
Tarzan!
Jane
(a) with what minimum speed (in m/s) must Jane begin her swing to just make it to the other side? (If Jane can make it across with zero initial velocity, enter 0.)
m/s
on a vine having length L and initially making an angle with the vertical (see below figure). Take D = 48.0 m,
(b) Shortly after Jane's arrival, Tarzan and Jane decide to swing back across the river (simultaneously). With what minimum speed (in m/s) must they begin their swing? Assume that Tarzan has a mass of 80.0 kg.
m/s
R=2.00
12V
2.00
4.00
4.002
What is the current in one of the 4.0 Q resistors?
An isolated point charge q is located at point X. Two other points Y and Z are such
that YZ2 XY.
Y
X
What is (electric field at Y)/(electric field at Z)?
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