Answer:
Explanation:
The sealed bottle serves as an open system for the water molecules, thus heat energy can be exchanged with its surroundings. When the bottle is placed in a warm environment, there would be a gradual increase in the thermal energy of the molecules of water due to a change in the temperature of its surroundings.
Thus, the molecules of water closer to the boundary of the bottle absorbs heat, becomes lighter and changes position. This gradual process continues until all molecules attains an average temperature which equals that of the surroundings of the bottle.
Therefore, both the thermal energy and temperature of the water increases.
Answer:
The value of variable capacitor is 
F
Explanation:
Given :
Inductance 
H
Frequency 
Hz
According to the cutoff frequency,
Now we find the value of capacitance,
F
Therefore, the value of variable capacitor is F
Answer:
The electrical energy supplied is 0.233 kWh
Explanation:
Given :
Mass of air 
kg
Initial temperature 
298 K
Final temperature 
350 K
Heat loss 
kJ
From the first law of thermodynamics,
We know that internal energy is proportional to difference of temperature,
Now we need answer into kWh so ( 1 kWh = 3600 kJ ).
So we need to multiply ( 
)
![W_{in} = [15 \times (350-298) + 60 ] \times \frac{1}{3600}](https://tex.z-dn.net/?f=W_%7Bin%7D%20%3D%20%5B15%20%5Ctimes%20%20%28350-298%29%20%2B%2060%20%5D%20%5Ctimes%20%5Cfrac%7B1%7D%7B3600%7D)
kWh
kWh
Therefore, the electrical energy supplied 0.233 kWh
Answer:
Explanation:
Mass of satellite
M_s = 361 kg
Distance of satellite from moon
h = 147 km = 147,000m
Radius of the moon is
R_m = 1740 km = 1740,000m
Mass of the moon is
M_m = 7.36 × 10²² kg.
The kinetic energy is equal to the potential energy of the body to the surface of the moon from the conservation of energy.
K.E = P.E = mgh
Gravity on moon is g = 1.62 m/s²
K.E = 361 × 1.62 × 147,000
K.E = 8.597 × 10^7 J.
B. The gravitational potential energy can be calculated using
U = G•M_s × M_m (1/R_s - 1 / R)
R is the total distance from the centre of the moon to the satellite
R = h + R_m = 147 + 1740 = 1887km
R = 1,887,000 m
U = 6.67 × 10^-11 × 361 × 7.36 × 10²² (1/1,740,000 - 1/1,887,000)
U = 6.67 × 10^-11 × 361 × 7.36 × 10²² × 4.48 × 10^-8
U = 7.93 × 10^7 J
Then,
The total energy becomes
E = K.E + U
E= 8.597 × 10^7 + 7.93 × 10^7 J
E = 1.653 × 10^8 J
Answer:
The question has the following answer options:
A. It decreases.
B. It increases.
C. It decreases then increases.
D. It does not change.
The correct answer is: D. It does not change.
Explanation:
The trajectory of a projectile is the path that a body follows when it has been thrown. It can be depicted in a coordinate system. Typically, the horizontal x axis stands for the distance that the object travels (in direction x) and the vertical and axis stands for the height (in direction y) of the throw. This very common form of movement is surprisingly simple to analyze if the following two assumptions are made:
1. The acceleration of free fall, g, is constant throughout the range of motion and is directed downward.
2. The effect of air resistance can be ignored.
With these assumptions, it is found that the curve that describes a projectile, and that it is known as its trajectory, is always a parable.
The horizontal velocity remains constant because in that direction the acceleration is zero.
