Answer:
4 (N/kg) or B
Explanation:
An application of the equation for Newton’s law of universal gravitation can be used to determine the gravitational field strength at the 2 kg object’s location.
Answer :Force is exerted by the Earth on the rock is 280 N .
Given :
Mass of rock falling falling , m = 28 kg .
Acceleration due to gravity , 
.
We need to find the force exerted by the earth on the rock .
Let force exerted be F .
Now , we know by Newton's Law Of Motion .
F = ma .......( 1 )
Here , m is mass and a is acceleration in this case it is .
Putting all these value in equation( 1 ) we get ,
Therefore, this is the required solution .
I also agree to A. The force will always pull back a lot deals with gravitational pull
Answer:
4.198 seconds
Explanation:
The total length of the yacht is 30m and the width of the bridge is 14.5m.
The speed of the yacht is 10.6m/s.
We can assume the current of the canal has a speed of 0m/s.
To calculate the answer we will break it into two parts
1) The time it takes for the bow to travel from the start of the bridge to the end
<em>Formula Speed = Distance / Time</em>
Speed = 10.6m/s
Distance = 30m
Time = T1
T1 = 2.8301s
2) The time it takes for the stern to cross the end of the bridge after the bow
<em />
<em>Formula Speed = Distance / Time</em>
<em />
Speed = 10.6m/s
Distance = 14.5m
Time = T2
T2 = 1.3679s
3) The Total Time is
Total = T1 + T2
Total = 4.198s
V₀ = V₁ + 2ax
V₀ = final velocity which is 0 m/s
V₁ = initial velocity which is 20 m/s
x = distance which is 60-(0.5 x 20) =50m
this is because his reaction time is 0.5 sec so he traveled 10m before stepping on the break paddle.
a= (V₀-V₁) / 2x
= (0-20) / 2*50
= -0.2m/s
the negative is because it is a deceleration speed hence it is 0.2m/s
