To calculate velocity, divide distance traveled by the time it took to travel that distance and add direction.
So either number 1 or number 3
Answer:
Explanation:
Given
mass of bullet
Length of barrel
Force
Work done
(b) When barrel is 1 m long
Answer:
Explanation:
The law of conservation of mass states that the mass of the elements at the beginning of the reaction(reactants) will equal the mass at the end of the reaction (product) .
In the chemical equation above,the total mass of the reactants is 80g(16+64) and the total mass of the products is also 80g(44+36).therefore the mass remained constant and that's how the equation represents the law of conservation of mass
A thing the question doesn't tell us: What direction is Mr. B walking ?
-- If Passenger B is walking West, in the same direction as the moving walkway, then the stationary observer sees him passing by toward the West at 3.5 km/hr.
-- If Passenger B, for some strange reason, is walking BACKWARDS, heading east on the moving walkway, then the stationary observer sees him passing by toward the EAST, at 0.5 Km/hr.
-- We're wondering why the question ever introduced us to Passenger-A. He never figures into the question in any way. He has no effect on Passenger-B, and we never hear from him again.
Answer: C, Temperature difference.