Answer: I have not learned this yet in class.
I am in 8th grade, I have not learned this stuff yet.
Answer:
The correct equation for calculating force is change in momentum divided by time. So 10 kg m/s divided by 3 s is 3.3 newtons (N
Explanation:
In order to find acceleration, you must do change in speed divided by the time taken. In this case, the car starts from rest which is 0m/s and reaches 20m/s which is a difference of 20m/s in speed. The time taken was 10 seconds so you do 20m/s ÷ 10 = 2m/s²
Answer:
Explanation:
for us to rank them we need to calculate the angle of refraction for the various materials. The angle of refraction is the angle between the refracted ray and the normal.
refractive index(n) = velocity of light in air/ velocity of light in medium
refractive index (n) = sini/sinr
lets equate the right side of both equations.
we will assume 30 degree as the angle of incidence for all materials.
(a) water
sinr = 0.75c/c *sin30
sinr = 0.375
r= arcsin0.375
r=22.02°
(b) ethyl alcohol
sinr = 0.7c/c *sin30
sinr = 0.35
r= arcsin0.35
r=20.49°
(c) crown glass
sinr = 0.6c/c *sin30
sinr = 0.3
r= arcsin0.35
r=17.46°
it is observed that the angle of refraction decreases as the velocity of light in glass decreases.
ranking the materials according to how much the light ray bends toward the normal, from most bending to least bending we have;
Crown glass > ethyl alcohol> water
Answer:
Option d)
Solution:
As per the question:
Work done by farm hand,
Force exerted, F' = 310 N
Angle,
Now,
The component of force acting horizontally is F'cos
Also, we know that the work done is the dot or scalar product of force and the displacement in the direction of the force acting on an object.
Thus
d = 3.406 m = 3.4 m