On a velocity - time graph, if the line crosses the x - axis it depicts that the object has started moving in the opposite direction.
Answer:
B, B (decreases, a clockwise)
Explanation:
Finally, the switch on the electromagnet is reopened. The magnitude of the external magnetic flux through the wire loop <u>decreases</u>, and there is <u>a clockwise</u>, current induced in the loop (as seen from the left).
1. To solve this problem, you must apply formula of Universal Gravitation Law, which is shown below:
F=Gm1m2/r²
F=2.75x10^-12
G=6.7x10^-11
r=2.6 m
m2=2m1
2. You must clear m1, as below:
F=G(m1)(2m1)/r²
F=G(2m1)²/r²
m1=√(Fr²/2G)
3. When you susbtitute the values into the formula m1=√(Fr²/2G), you obtain:
m1=√(Fr²/2G)
m1√0.13
m1=0.37
m2=2m1
m2=2(0.37)
m2=0.74
4. Therefore, the answer is:
m1=0.37
m2=0.74
Answer:
Explanation:
Given
Mass of girl ![m=45 kg](https://tex.z-dn.net/?f=m%3D45%20kg)
Mass of Plank ![M=159 kg](https://tex.z-dn.net/?f=M%3D159%20kg)
let
and
be the velocity of Plank and girl w.r.t ice
therefore ![v_{gp}=1.38 m/s](https://tex.z-dn.net/?f=v_%7Bgp%7D%3D1.38%20m%2Fs)
Conserving Momentum
![(M+m)v_p+mv_{gp}=0](https://tex.z-dn.net/?f=%28M%2Bm%29v_p%2Bmv_%7Bgp%7D%3D0)
![(45+159)v_p=-45\cdot v_{gp}](https://tex.z-dn.net/?f=%2845%2B159%29v_p%3D-45%5Ccdot%20v_%7Bgp%7D)
![v_p=-\frac{45}{204}\cdot 1.38](https://tex.z-dn.net/?f=v_p%3D-%5Cfrac%7B45%7D%7B204%7D%5Ccdot%201.38)
![v_p=-0.304 m/s](https://tex.z-dn.net/?f=v_p%3D-0.304%20m%2Fs)
![v_{gp}=v_g-v_p=1.38](https://tex.z-dn.net/?f=v_%7Bgp%7D%3Dv_g-v_p%3D1.38)
![v_g=-0.304+1.38=1.075 m/s](https://tex.z-dn.net/?f=v_g%3D-0.304%2B1.38%3D1.075%20m%2Fs)
Answer choice C is a benefit of coal; all the others are negatives.
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