Answer:
5m/s²
Explanation:
Given parameters:
Mass of wagon = 10kg
Force of pull = 70N
Frictional force = 20N
Unknown:
Acceleration of the wagon = ?
Solution:
Frictional force is a force that opposes motion.
The net force is given as:
Net force = mass x acceleration
Force of pull - Frictional force = mass x acceleration
Insert the parameters and solve;
70 - 20 = 10 x acceleration
50 = 10 x acceleration
Acceleration = 5m/s²
False . accelerating means to increase but moving at a constant speed means you stay the same .
Answer:
is the no. of electrons
Explanation:
Given:
- quantity of charge transferred,
<u>No. of electrons in the given amount of charge:</u>
As we have charge on one electron 
so,
is the no. of electrons
- Now if each water molecules donates one electron:
Then we require 
molecules.
<u>Now the no. of moles in this many molecules:</u>
where
Avogadro No.
- We have molecular mass of water as M=18 g/mol.
<u>So, the mass of water in the obtained moles:</u>
where:
m = mass in gram
Answer:
b. The internal resistance must be much smaller than the other resistances in the circuit.
Explanation:
Ammeter is used to measure the current flowing through a circuit. It is connected in series configuration with the load. In such a scenario the resistance of the ammeter should be negligible so as to make sure that the voltage drop across the resistance of ammeter is zero and it shows the correct reading of the current in the circuit.
Answer:
1.35 kJ
Explanation:
KE = ½mv² = ½ × 0.030 kg × (300 m·s⁻¹)² = 1350 J = 1.35 kJ
