Answer:
Friction always acts to oppose any relative motion between surfaces. ... If we push on the book with a force of less than 5 N, the book won't move, because the frictional force will exactly balance the force we apply. If we push with a 1 N force, a 1 N frictional force opposes us.
Explanation:
none
Answer:
Section: 4–1 Topic: Newton's First Law: The Law of Inertia Type: Conceptual ... B) whether an object is at rest or is moving with constant velocity depends on the ... E) The acceleration of a body is proportional to the net external force acting on it ... The position vector at t = 2 s is. A) jm im r ˆ0.5ˆ0.1. +. = D) jm im r. ˆ0.10ˆ0.2. +.
Explanation:
Answer: E. None of the above
Explanation: The energy of a photon is given by the formula below.
E=hf or E = hc/λ
E = energy, h = planck constant, c= speed of light and
λ= wavelength.
From E=hf we can see that energy is directly proportional to frequency since h is a constant, this implies that as we move up the visible light spectrum, red light has the least frequency this accounting for the lowest energy while violet has the largest energy accounting for a very high energy.
Blue light is higher in the spectrum than red light.
This implies that blue light has more energy than red.
Visible light is part of the electromagnetic spectrum which implies that they all travel with the same speed of a constant value ( speed of light = 3* 10^8 m/s).
Thus in conclusion, blue light has more energy that red light but they both travel with the same speed.
This point nullifies the options thus making none of it correct.
Answer:
Electric field, 
Explanation:
Given that,
Charge, 
We need to find the magnitude of electric field 17.1 cm (0.171 m) above an isolated charge. Electric field at a point is given by :
So, the electric field is 
. Hence, this is the required solution.
