Answer:
M = 3.485 kg
m = 1.605 kg
Explanation:
F = 0.98 x 10^-8 N
r = 19.5 cm = 0.195 m
M + m = 5.09 kg ...... (1)
By use of Newton's gravitational law
F = G m1 m2 / r^2
0.98 x 10^-8 = 6.67 x 10^-11 x M x m / (0.195)^2
M x m = 5.59
M - m = 1.88 .........(2)
By solving the equation (1) and equation (20, we get
M = 3.485 kg
m = 1.605 kg
Answer:
B) A planet's speed as it moves around the sun will not be the same in six months.
Explanation:
A planet's speed as it moves around the sun will not be the same in six months, is a statement that CANNOT be supported by Kepler's laws of planetary motion.
Answer:
-67 m/s
Explanation:
We are given that
Mass of ball,m=0.4 kg
Initial speed,u=14 m/s
Impulse,I=-32.4 N-s
Time,t=27 ms=
We have to find the mass's velocity in the x- direction.
We know that
Substitute the values
Question 1
Adding an electron has no effect on the mass number but it reduces the atomic number by 1.
So, 234 91 Protactinium plus 0 negative 1 electron results to Thorium234 and
<span>7 4 Beryllium plus 0 negative 1 electron will result to </span><span>Lithium7
</span>Adding a Helium particle increases the mass number of the daughter nuclei by 4 and the atomic number by 2.
So, <span>234 90 Thorium plus 4 2 Helium will results to </span><span>Uranium238 and
</span>222 86 Radon plus 4 2 Helium will result to <span>Radium226.
<span>Question 2
</span>The mass number is the sum of protons and neutrons. If an element has y protons and x neutrons, then its mass number will be (y+x).<span>
</span></span><span>88 38 Strontium. This element has a mass number of 88 and atomic number(number of protons) 38. Neutrons = 88 - 30 = 50.
Doing the same for the other elements we have;
</span>14 6 Carbon ⇒ Neutrons = 14 - 6 = 8
<span> 127 53 Iodine </span>⇒Neutrons = 127 - 53 = 74<span>
4. 39 19 Potassium </span>⇒ Neutrons = 39 - 19 = 20