Because ice is less dense than liquid water,
its melting point is lowered under high pressures.
A long standing theory says that this is what causes ice to be slippery:
As you step on it, the pressure of your weight causes the top layer to my into water.
The answer is A. Trust me!
Answer:
Explanation:
Given that the temperature of 
of water and 
of water are
at 
and 
respectively.
Let 
, 
and 
, 
.
The specific heat capacity of water is,
.
Let the final temperature of the mixture be 
.
As there is no energy loss, so, the energy loss by the water at higher temperature, i.e. , will be equal to the energy gain by the water at lower temperature, i.e. .
[ both sides divided by 
]
Now, putting the given value in the above equation, we have
Hence, the temperature of the mixture will be .
<span>
The answer is - both magnetic poles</span>
<span>In the earth's southern magnetic pole, auroras are known as aurora austalis or southern lights while in the northern magnetic pole they are known as aurora borealis or northern lights.</span>
<span>They are caused by charged particles borne in solar winds that are escaping from the sun. As they approach the earth, the winds distort the earth's magnetic field which allows some particles to enter the earth's atmosphere, where they excite the gases and make them glow with spectacular display of colors.</span>
<span>
</span>
<span>
</span>
Answer:
(C) 40m/s
Explanation:
Given;
spring constant of the catapult, k = 10,000 N/m
compression of the spring, x = 0.5 m
mass of the launched object, m = 1.56 kg
Apply the principle of conservation of energy;
Elastic potential energy of the catapult = kinetic energy of the target launched.
¹/₂kx² = ¹/₂mv²
where;
v is the target's velocity as it leaves the catapult
kx² = mv²
v² = kx² / m
v² = (10000 x 0.5²) / (1.56)
v² = 1602.56
v = √1602.56
v = 40.03 m/s
v ≅ 40 m/s
Therefore, the target's velocity as it leaves the spring is 40 m/s
