Answer:
Refractive index of material is 2
Explanation:
If speed of light in medium is v then speed of light in vacuum will be 2v
Refractive index = v1/v2 = 2v/v = 2
Gravity is an example of friction. If we didn't have gravity, we would be flying all over the place. Also, friction keeps us from sliding on the ground and falling.
Given that,
Horizontal force, F = 600 N
A mover pushes a dresser 9 meters across a bedroom.
To find,
The work done by the mover.
Solution,
The work done by an object is given by :
W = Fd
Where d is distance
W = 600 N × 9 m
= 5400 J
So, the work done by the mover is 5400 J.
Answer: 53 dal
Explanation: 5.3x10=53, to get dal you have to multiply by 10 to get 5.3x10=53.
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Answer:
area is 0.245 m²
Explanation:
The equation for pressure is
P = F / A
Where P is the pressure, F the force and A the area where the force is applied.
With the data we can calculate the pressure applied by the feet on the human on the floor
P1 = W / A = mg / A
P1 = 75 9.8 / 0.05
P1 = 14700 Pa
Now they tell us that the maxi maque pressure supports the snow is 3 kPa = 3000 Pa, the way to decrease the pressure is to increase the area on which force is applied.
P2 = F / A2
In this case we will calculate the minimum area, so we use the maximum pressure that supports the snow (P2 = 3000 Pa) and the force remains the weight of man
A2 = F / P2
A2= mg / P2
A2 = 75 9.8 / 3000
A2 = 0.245 m²