Answer: rate at which energy is being removed is 58.9J/s or 58.9W
Explanation:
Given;
Mass of water Mw =892g = 0.892kg
Mass of aluminium Ma = 214g = 0.214kg
Rate of change in temperature ∆T = 0.9°C per minute
Specific heat capacity of water Cw = 4186J/kgC
Specific heat capacity of aluminium Ca = 900J/kgC
Since both the water and aluminium are at thermal equilibrium and the decrease with the same rate, the energy removed per minute is given as;
Q = (MwCw + MaCa)∆T
Q = (0.892×4186 + 0.214×900)×0.9
Q = 3533.8608J per minute
To determine the energy being removed in watts
P = Q/t
P = 3533.8608J/60s
P = 58.89768W
P = 58.9W
Explanation:
You would lose extra body heat causing a little bit of cooling
Answer:
1. The frequency of the incident light must be equal to or greater than the threshold frequency of the photons before emission could take place.
2. The intensity of the incident light is proportional to the amount of photons released. The higher the intensity of light, the greater the amount of photons ejected.
Explanation:
1. Photoelectric effect is the process by which light with sufficient frequency falls on the surface of a material, e.g metal, to emit electrons. The incident light must have a minimum value of required frequency for the electrons to be ejected. This energy is termed work function which is a function of frequency.
So for emission to take place, the frequency of the incident light must be equal to or greater than the threshold frequency of the photons.
2. The intensity of light is a measure of the amount of light per unit area. When the intensity of incident light increases, the probability that photons would be released increases. The intensity of the incident light is proportional to the amount of photons released.
Answer:
1.To get your team to 25 points each period by serving, spiking, and setting the ball
2. A gymnasium with volleyball court markings, a net, a volleyball
Answer:
D.Tetrahedral
Explanation:
The central atom has 0 lone pair and 4 bond pairs. Hybridization is sp³. The geometry is tetrahedral which has an angle of 109.5°.
According to VSEPR theory, each molecule arranges itself such that it faces minimum repulsion and the given molecule is of type 
.
Therefore the answer will be D.
D.Tetrahedral
