This shifts the star’s spectral lines toward the blue end of the spectrum. If the star is moving away from us, it’s waves are effectively stretched out when they reach earth, increasing their wavelength. This shifts the star’s spectral lines toward the red end of the spectrum.
Answer: 299,427.84 J, 99,809.28 W
Explanation: we will assume the acceleration of the body to be constant, hence newton's laws of motion is applicable.
From the question
Force (f) = 75 N
Mass of object (m) = 6kg
Initial velocity (u) = 20 m/s
Final velocity (v) = 58 m/s
Time taken (t) = 3s
Recall that
F = ma
75 = 6a
a = 75/6 = 12. 5 m/s²
We need to get the distance before we can get the work done.
Recall that v² = u² + 2as, where s = distance covered
56² = 20² + 2(12.5)s
56² - 20² = 25s
2736 = 25s
s = 2736/ 25 = 109.44m
Work done = force × distance
Work done = 75 × 109.44 = 299,427.84 j
Power = work done / time
Power = 299,427.84 / 3
Power = 99,809.28 W
Answer:
b. Thermal energy will flow from your hand to the snowball.
Explanation:
How far it moves over a certain period of time, but unlike the term "speed" velocity is a vector quantity and tells you the direction of an object (speed is also distance over time just without a direction). This means an object can have negative velocity, but it can't have negative speed.
Given Information:
Mass of sock = 0.23 kg
Stretched length of sock = x = 2.54 cm = 0.0254 m
Required Information:
Spring constant = k = ?
Answer:
Spring constant = k = 88.82 N/m
Explanation:
We know from the Hook's law that
F = kx
Where k is spring constant, F is the applied force and x is length of sock being stretched.
k = F/x
Where F is given by
F = mg
F = 0.23*9.81
F = 2.256 N
So the spring constant is
k = 2.256/0.0254
k = 88.82 N/m
Therefore, the spring constant of the sock is 88.82 N/m
