Answer:
4.9 m/s
Explanation:
Since the motion of the ball is a uniformly accelerated motion (constant acceleration), we can solve the problem by using the following suvat equation:
![v^2-u^2=2as](https://tex.z-dn.net/?f=v%5E2-u%5E2%3D2as)
where
v is the final velocity
u is the initial velocity
a is the acceleration
s is the distance covered
For the ball in this problem,
u = 0 (it starts from rest)
is the acceleration
s = 3 m is the distance covered
Solving for v,
![v=\sqrt{u^2+2as}=\sqrt{0+2(4)(3)}=4.9 m/s](https://tex.z-dn.net/?f=v%3D%5Csqrt%7Bu%5E2%2B2as%7D%3D%5Csqrt%7B0%2B2%284%29%283%29%7D%3D4.9%20m%2Fs)
The correct answer is A. Each object in the universe that has mass attracts every other object that has mass.
Explanation:
The gravitational law proposed by Newton explains how the gravitational force works. The basic idea or premise in this law is that the gravitational law exists in all the universe, and occurs with all objects that have a mass. This includes the fact all objects or particles that have a mass attract all other objects with mass but this is also influenced by the distance between the objects, and the masses of each object. In this way, the gravitational force is equal to the gravitational constant multiplied by the mass of the two objects and divided by the distance between the objects.
Answer:
Increase the temperature of juice in Glass A by 20 °C
12km = 12000m
12000m / 4 m/s = 3000s
just under one hour
(263.1 years) x (half-life / 87.7 years) = 3 half-lifes
In 3 half-lifes, (1/2 x 1/2 x 1/2) = 1/8 of the atoms in a sample remain unchanged.
That's 12.5% that remain unchanged.
The other 87.5% of the atoms in the sample have decayed, and changed to either other isotopes of plutonium or into atoms of other elements.