Answer:
B is true
Explanation:
This question seems to be incomplete or wrongly written, anyway B is the only one that is true.
Planetary orbits have kinetic and potential energy, the sum of these remains about constant. When closest to the Sun the planet has the lowest potential energy, at this point kinetic energy is maximum, and since speed is related to kinetic energy
at maximum kinetic energy speed is maximum too.
A is false because while planets do travel in elliptical orbits, the Sun is not at the center but in one of the focuses.
C is false, you can check the orbital speeds of any of the outer planets. They are slower because at the heigt the orbit there is a smaller gravitational pull. SInce the gravitational pull is the centripetal force, and orbital speed depends on this force, their speed is slower.
Answer:
The centripetal acceleration of the girl is 2.468 m/s²
Explanation:
Given;
number of turns, = ¹/₄ Revolution
distance traveled by the girl, d = 25 m
time of motion, t = 5.0 s
The linear speed of the of the girl is calculated as;
The centripetal acceleration of the girl is calculated as;
Therefore, the centripetal acceleration of the girl is 2.468 m/s²
Refer to the diagram shown below.
T = the tension in the rope
N = the the normal reaction (the force that the table exerts on the box)
W = the hanging weight
Assume that the pulley is frictionless.
For equilibrium,
T = W
and
T + N = 77
Therefore
N = 77 - W
(a) When W = 30 N,
N = 77 - 30 = 47 n
Answer: 47 N
(b) When W = 60 N,
N = 77 - 60 = 17 N
Answer: 17 N
(c) When W = 90 N
N = 77 - 90 = - 13 N
There is no normal reaction, and the system is no longer in equilibrium.
Instead, the box will be lifted by a force of 13 N, and the box will accelerate upward.
Figure 1, because it is a compound.
Answer: Diffusion
Explanation: Please give brainliest
