How might the most common occurring stars be described, based on our stellar neighborhood?

A. White Dwarfs
B. K giants
C. A main sequence
D. M main sequence

The most common stars are Red Dwarfs. I don't like the answer choices. Most of them are M type stars.

To heat up one kg of body 1 degree celcius takes one calorie. How many calories would the t. rex need per thirty minutes at room temperature to maintain it's body temperature? There are a whole SERIES of these kinds of questions on my science assinment, and I have no idea how to do this. We've done many "like this one" assignments, but never something exactly like this. Please help!

a

It's the M main sequence in case your still wondering lol

To determine how many calories the T. rex would need per thirty minutes to maintain its body temperature, we need to make some assumptions and calculations.

Assumption 1: The body temperature of the T. rex is maintained at a constant temperature.
Assumption 2: The room temperature is the same as the desired body temperature of the T. rex.

Based on these assumptions, we can calculate the energy required using the specific heat capacity formula:

Energy (calories) = mass (kg) × specific heat capacity (calories/kg °C) × change in temperature (°C)

Since we are interested in heating up the body by 1 degree Celsius, we can simplify the formula:

Energy (calories) = mass (kg) × change in temperature (°C)

The specific heat capacity for water is approximately 1 calorie/gram °C. Assuming the T.rex's mass is 10,000 kg, we can calculate the energy required:

Energy (calories) = 10,000 kg × 1 °C = 10,000 calories

Therefore, the T. rex would need 10,000 calories per thirty minutes at room temperature to maintain its body temperature.

To answer the question, we need to calculate the total amount of heat energy needed to maintain the T. rex's body temperature for 30 minutes at room temperature.

First, we need to determine the specific heat capacity of a T. rex. The question states that it takes one calorie to heat up one kilogram of body by one degree Celsius. This means the specific heat capacity of the T. rex's body is 1 calorie per kilogram per degree Celsius.

Next, we need to determine the mass of the T. rex. Let's assume the mass of the T. rex is 5,000 kilograms (a rough estimate of an adult T. rex's weight).

The change in temperature is the difference between the T. rex's body temperature and room temperature. Let's assume the T. rex's body temperature is 37 degrees Celsius (close to the average body temperature of mammals) and the room temperature is 25 degrees Celsius.

Therefore, the change in temperature is 37 - 25 = 12 degrees Celsius.

Now, we can calculate the total amount of heat energy needed using the specific heat capacity formula:

Heat energy = mass × specific heat capacity × change in temperature

Heat energy = 5000 kg × 1 cal/(kg·°C) × 12 °C

Heat energy = 60000 calories

Therefore, the T. rex would need 60,000 calories to maintain its body temperature for 30 minutes at room temperature.