A chemical reaction involves one or more reactants changing into new products
Answer:
A) The wave that travels through the rail reaches the microphone first.
B) separation in time between the arrivals of the two pulses is 0.01539 seconds.
Explanation:
Detailed explanation and calculation is shown in the image below
Answer:
I think D. maybe C
Explanation:
newtons is force of gravity and grams can be weight or mass in the metric system
Answer:

Explanation:
Given:
mass of the boat, 
uniform speed of the boat, 
rate of accumulation of water mass in the boat, 
time of observation, 
The mass of the boat after the observed time:



<u>Now using the conservation of momentum:</u>



Answer:
B. 34.78 m/s
Explanation:
Momentum of a body or an object is given as the product of its velocity and its mass.
Therefore;
Momentum= velocity x mass
But; velocity = ? mass =115 kg , momentum = 4,000 kgm/s
Thus; velocity= momentum/mass
= 4,000/115
= 34.78 m/s