Answer: D(t)= 50(4/5)^t
Explanation: If 1/5 of the temperature difference is lost each minute, that means 4/5 of the difference remains each minute. So each minute, the temperature difference is multiplied by a factor of 4/5 (or 0.8).
If we start with the initial temperature difference, 50° Celsius, and keep multiplying by 4/5, this function gives us the temperature difference t minutes after the cake was put in the cooler.
When calcium oxide reacts with water, then it combines with water and forms calcium hydroxide.
CaO + H2O → Ca(OH)2
Calcium oxide + Water → Calcium hydroxide
Basic oxides are oxides that show basic properties in opposition to acidic oxides and that either react with water to form a base
Learn more about Basic Oxides here:
brainly.com/question/15578795
#SPJ4
Initial volume of water is 155 mL. Convert the mass of iron and lead into volume using density values as follows:
d=\frac{m}{V}
Here, d is density, m is mass and V is volume of objects
volume of piece of iron can be calculated as:
V=\frac{m}{d}=\frac{15 g}{7.86 g/mL}=1.90 mL
Similarly, volume of lead can be calculated as:
V=\frac{m}{d}=\frac{20 g}{11.3g/mL}=1.77 mL
To calculate the final volume of water, volume of both iron and lead should be added to the initial volume of water.
V_{final}=V_{initial}+V_{iron}+V_{lead}=155 mL+1.90 mL+1.77mL=158.67 mL
Thus, new water level in milliliters will be 158.67 mL.
The time taken by the light reflected from sun to reach on earth will be 8.4 minutes.
To find the answer, we need to know about the distance travelled by light.
<h3>How to find the time taken by the light reflected from sun to reach on earth?</h3>
- So, in order to solve this problem, we must first know how far the moon is from Earth and how far the Sun is from the moon.
- These distances are given as 3.8×10^5 km (Earth-Moon) and 1.5×10^8 km (Sun- Earth).
- Since the Moon and Sun are on opposite sides of Earth during a full moon, the light's distance traveled equals,
- As we know that light travels at a speed of 300,000 km per second. then, the time taken by the light reflected from sun to reach on earth will be,
Thus, the time it takes for the light from the Sun to reach Earth and be recognized as 8.4 minutes.
Learn more about distance here:
brainly.com/question/11495758
#SPJ4
Answer with Explanation:
It is given that
1) Force of Drag
2) Weight
Equating drag and weight we get
where,
'm' is mass of the object
'g' is acceleration due to gravity
'A' is the area of the person
is the density of air
Approximating the weight of a man to be 75 kg and area of man
Applying the values in the formula we get