Answer: D. Time and length
Explanation.
Time is always measured relative to some reference time, so it is relative.
Mass is the matter that defines an object. It could be converted into energy but its quantity does not change, so it is not relative.
Length is a measurement that is compared against a standard, so it is relative.
A blue star has the hottest temperature.
Answer: Option B
<u>Explanation:
</u>
Stars are composed of gases which ignite themselves and converge in a spherical shape. Their energy is stored in a specific spherical structure depending upon their gravity. Each star has its own gravity formed by the mass of igneous gas combined to form a star.
They illuminate the cosmic area and their lights can travel much longer distances. The stars can be classified based on spectral frequency or the light they are emitting and also based on their temperature. Thus, the star with the coolest temperature is termed as Red stars and the star with the hottest temperature is termed as blue stars.
W = Fd
W = 1225 N x 10 m = 12250
Answer:
The electron is 5.88 m far from origin when it momentarily stops.
Explanation:
The position of electron on x-axis is given by the equation:
x = 16 t m __________ eqn(1)
The speed of particle can be found out by taking derivative of "x" with respect to "t"
V = dx/dt = 16[-t + ]
V = 16(1 - t)
Now, when the electron stops, its velocity becomes zero.
V = 0 = 16(1 - t)
(1 - t) = 0
<u>Either</u>: = 0
-t = ln(0)
t = infinity (Since, time can not be infinite, thus this answer is rejected)
<u>Or</u>: 1 - t = 0
<u>t = 1 sec</u>
Therefore, at t= 1 sec, the electron will stop momentarily.
Using t = 1 sec in eqn (1), we find the position of electron.
x = 16(1) m
<u>x = 5.88 m</u>
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Answer:
in t seconds, Car A sweep out t radian { i.e θ = t radian }
Explanation:
Given the data in the question;
4 toy racecars are racing along a circular race track.
They all start at 3 o'clock position and moved CCW
Car A is constantly 2 feet from the center of the race track and moves at a constant speed
so maximum distance from the center = 2 ft
The angle Car A sweeps out increases at a constant rate of 1 radian per second.
Rate of change of angle = dθ/dt = 1
Now,
since dθ/dt = 1
Hence θ = t + C
where C is the constant of integration
so at t = 0, θ = 0, the value of C will be 0.
Hence, θ = t radian
Therefore, in t seconds, Car A sweep out t radian { i.e θ = t radian }