Explanation:
When water is boiled in the flask . Some portion of it is evaporated out . Now when cork is placed on it and is placed in the ice box . It cools down , by which the pressure inside decreases .
Due to decrease of pressure , the boiling point of water also decreases . Now it can boil at lower temperature . Thus it starts boiling at lower temperature even , when placed in the ice box .
Answer:
The tension of the rope is T= 172.52 N
Explanation:
m= 21 kg
α= 21º
μ= 0.285
a= 2.09 m/s²
g= 9.81 m/s²
W= m*g
W=206.01 N
Fr= μ*W*cos(α)
Fr= 54.81 N
Fx= W * sin(α)
Fx= 73.82 N
T-Fr-Fx = m*a
T= m*a + Fr + Fx
T= 172.52 N
Answer:
Common velocity will be 2 m/sec
Explanation:
We have given a car of mass 1000 kg is traveling in east at 20 m /sec
So and ( take east direction as positive )
And another car of mass 1500 kg is moving with 10 m/sec in west direction
So and ( west direction will be negative direction )
According to law of conservation of momentum
So common velocity will be 2 m/sec
If you look from top of conductor carrying current with direction of current pointing towards you, direction of the magnetic field will be in counterclockwise direction around the current carrying wire.
Hence D is the correct option.
Hope this helps!
Answer:
D. A battery provides electrical energy to power a phone.
Explanation:
Examples of current electricity are starting a car, turning on a light, cooking on an electric stove, watching TV, shaving with an electric razor, playing video games, using a phone, charging a cell phone and more.