Answer:
Top speed is 31.68 m/s
Explanation:
Speed of a body is the distance traveled by the body in unit time.
Speed is generally expressed in meter per second or kilometer per hour.
Here, the cheetah travels a distance of 274 m in 8.65 s.
Therefore, speed of cheetah is the distance traveled by it in one second.
For 8.65 s, distance traveled is 274 m
For 1 s, distance traveled will be 
meters per second. This value is called speed.
So, speed is given as the ratio of the distance traveled to that of the time taken.
∴ Top speed of cheetah is given as:
Here, 
is the top speed of cheetah.
Answer:
Explanation:
Let the charge on the ball bearing is q.
charge on glass bead, Q = 20 nC = 20 x 10^-9 C
Force between them, F = 0.018 N
Distance between them, d = 1 cm = 0.01 m
By use of Coulomb's law in electrostatics
By substituting the values
Thus, the charge on the ball bearing is
The speed of the car is 18.8 m/s
Explanation:
The variables that represent the givens are:
m = 2000 kg (mass of the car)
r = 30 m (radius of the curve)
t = 10 s (time elapsed to cover the curve)
The unknown is the speed of the car, which is given by:
where d is the distance covered by the car during the time t.
Here the car covers a circular trajectory of radius r, so the distance covered is
Therefore, the speed of the car is
Learn more about circular motion:
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The 'plum pudding<span>' </span>model of the atom<span> was proposed by JJ Thomson, who had also discovered the </span>electron<span>. It was put forth before the discovery of the nucleus. According to this </span>model<span>, the </span>atom<span> is a sphere of positive charge, and negatively charged </span>electrons<span> are embedded in it to balance the total positive charge.</span>
