Answer:
Coulomb's Law states
F = K Q1 * Q2 / R^2 where K is the force constant
F2 / F1 = 2 Q1 * Q2 / (Q1 * Q2) = 2 where one of the charges is doubled
So the force will be doubled (D looks rather vague but it cannot be the other three)
Answer:
D. a windstorm scratches the surface of a rock with sand.
complete question:
An observer at the top of a 462-ft cliff measures the angle of depression from the top of the cliff to a point on the ground to be 5°. What is the distance from the base of the cliff to the point on the ground? Round to the nearest foot
Answer:
a ≈ 5281 ft
Explanation:
The observer at the top of a 462 ft cliff measures the angle of depression from the top of the cliff to a point on the ground to be 5°.
The angle of depression form the top of the cliff = 5°
The 5° is outside the triangle formed . To find the angle in the triangle we have to subtract 5° from 90°. 90° - 5° = 85° Note sum of an angle on a right angle is 90°.
using SOHCAHTOA principle we can solve for the distance from the base of the cliff to the point on the ground(a)
tan 85° = opposite / adjacent
tan 85° = a / 462
cross multiply
462 × tan 85° = a
a = 11.4300523 × 462
a = 5280.66 ft
a ≈ 5281 ft
Answer:
Newtons 1st law
Explanation:
Newtons first law can be summarized by intertia; an object at rest will remain at rest, and an object in motion will remain in motion unless an unbalanced force is applied.
Lets say a car is moving at 25m/s. The person in the car is also moving at 25m/s. If the driver suddenly slams on the brakes, the car will stop moving, but the person will not stop, as they were already moving from before. There are no 'brakes' on a human, so the driver will smash through the windshield most likely.
The driver was already in motion, and when the car is at rest, for that little time, the human is not at rest, the human is still in motion so they will remain in motion, and the unbalanced force acted on them will be the windshield, or whatever it may be to cause the human to remain at rest.