Answer:
Explanation:
Density = Mass / Volume = 850 / 40*10*5 = 0.425 g /cm^3
50N.
The magnitude of the reaction to any force is equal to the magnitude of the first force. (See Newton #3.)
Answer:
v = -24.5 m/s
Explanation:
Use conservation of momentum P = m*v. Unless there are external forces involved, total momentum must be conserved.
P: momentum
m: mass
v: velocity
1. calculate the total momentum before the collision:
2. the total momentum after the collision must not change:
3. after the collision the velocity of the car is the same as the velocity of the truck:
4. combining 2. and 3.:
5. this equation only has one unknown and can be solved for v:
As a transformer generates ac current of different voltage when the switch is closed and the current flows in the primary coil which induces a magnetic field.
Answer: Option 2
<u>Explanation:</u>
A transformer is an electric device which can vary the potential differences or voltages of an alternating current. It's a simple device composed of an iron core, a primary and the secondary current conducting coil.
The primary coil is attached to the switch which provides ac current through potential difference. Now this current induces a magnetic field in the iron core. When the voltage of this ac current is varied, the magnetic field varies and starts inducing ac current of different voltage in the secondary coil.
Thus, an AC current of different voltage flows in the secondary coil that can be used in small electric devices. This is how a transformer works. There are two kinds of transformers- Step Up and Step Down. A step up transformer increases the potential difference whereas the step down does the opposite.
Answer:
Explanation:
specific heat of granite S = 800 J /g°C
increase in temperature = 15.5 °C .
mass = m ( let )
Heat needed to raise temp = mass x specific heat x rise in temperature
150,000 = m x 800 x 15.5
m = 12.096 g .
