Answer;
The above statement is True
Kinetic friction is affected by the weight of the object.
<h3><u>Explanation;</u></h3>
- Kinetic friction is a force that acts between moving surfaces. An object that is in motion over a surface experiences a force in the opposite direction to the direction of movement.
- The equation for kinetic friction is given by the formula;
F= coefficient of friction * Normal force.
- Normal force is the force of the table pushing back on the block and can be calculated by formula;
F = mass* acceleration due to gravity.
- Therefore, the weight of an object determines its kinetic friction.
Answer:
For two universe that is the same size, the universe with the faster expansion rate must be <u>younger</u> than the universe with a slower expansion rate. The slope in the line of the Hubble plot of the <u>older</u> universe will be <u>flatter</u>.
Explanation:
Hubble's law establishes a direct relationship between a galaxy's distance and its redshift-determined recessional velocity. The redshifts of galaxy clusters and distant galaxies are equivalent and proportional to their distances from us, according to Hubble's theorem.
Thus, to copy and complete the given question.
For two universe that is the same size, the universe with the faster expansion rate must be <u>younger</u> than the universe with a slower expansion rate. The slope in the line of the Hubble plot of the <u>older</u> universe will be <u>flatter</u>.
Answer:
1) b. more quickly than
Explanation:
It is stated in the question that Albert's watch is ticking more slowly than more quickly than at the same rate as her own watch.
Answer:
2) a. more slowly than
Explanation:
Albert's watch is ticking more slowly than more quickly than at the same rate as her own watch.
Answer:
The distance between interference fringes increases.
Explanation:
In a double-slit diffraction pattern, the angular position of the nth-maximum in the diffraction patter (measured with respect to the central maximum) is given by
where
is the angular position
is the wavelength
d is the separation between the slits
In this problem, the separation between the slits decreases: this means that d in the formula decreases. As we see, the value of 
(and so, also ) is inversely proportional to d: so, if the d decreases, then the angular separation between the fringes increases.
So, the correct answer is
The distance between interference fringes increases.
Answer:
Ball A
Explanation:
Let the initial speed of the balls be u .
Angle of projection for ball A = 20°
Angle of projection for ball B = 75°
As we know that at highest point, the ball has only horizontal speed which always remains constant throughout the motion because the acceleration in horizontal direction is zero.
Speed of ball A at highest point = u Cos 20° = 0.94 u
Speed of ball B at highest point = u Cos 75° = 0.26 u
So, the ball A has bigger speed than B.
