Planets from which of the following?

Just before opening her parachute a skydiver of mass 50 kg reaches terminal velocity.calculate the force of air resistance

Bad White [126]

Terminal velocity is described as a velocity attained when an object which falls freely experiences 0 net force owing to gravitational force which is balanced by the resistance of the air. Hence, there is no acceleration thus, the velocity is constant. In order to attain terminal velocity by the skydiver, the weight of the skydiver must be equal to the resistance of the air hence we have the equation below;

50 kg*9.8 m/s²= 490 Newton.

Summarily, the force or magnitude of the air resistance is 490 Newton

3 0

3 years ago

A fish feeds on algae in a pond. As a result, there is an energy transfer between trophic levels in the ecosystem.

seropon [69]

Answer: D. cellular respiration

Explanation:

Cellular respiration is a process which involves the break down of glucose molecules into water and carbon dioxide present in the food so as to release energy in the body in the form of ATP and also releases wastes.

The fish being a consumer in the food chain will eat algae as a food source. The cellular respiration process in fish will break down the glucose molecules in the algal food and will provide energy to the fish.

6 0

3 years ago

How do the structures of a vacuole and a nucleus differ?

beks73 [17]

Answer:

D

Explanation:

Vacuoles are pockets that collect water and the cell's junk. The nucleus sends commands to other cell parts and contains DNA.

Why it isn't A: Both have membranes.

Vacuole- tonoplast. Nucleus- Nuclear membran.

Why it isn't B: The Vacuole is not a thick fluid, though it may hold thick fluid.

Why it isn't C: This should be obvious.

7 0

3 years ago

The diagram below represents some changes that took place in a bacterial population recently exposed to an antibiotic.Which stat

FrozenT [24]

About the question:

You will find the diagram used to answer the question in the attached files.

Answer:

D) Some of the bacterial population was resistant to this antibiotic.

Explanation:

The term resistance refers to an inheritable change in a population sensitivity, reflected through the consecutive failure of the chemical effects, correctly used to reach a desired effect on the target population.

The excessive use of antibiotics on the bacteria population leads to the fixation of new mutated genes -by natural selection-. The mutated genes make these cells even more resistant to the drug.

In the exposed example we have,

Day 1 ⇒ a big population of white bacteria and only one black cell, probably carrying mutated genetic material.

The population was treated with antibiotics.

Day 2 ⇒ there are fewer white bacteria and three black cells. This means that white bacteria are dying, while the black ones are reproducing.

The mutated phenotype gets to survive under the effects of the chemical.

Day 3 ⇒ There are no more white bacteria. Only the black population survived and keeps reproducing.

The mutated bacteria reproduce with the capability of tolerating the antibiotic dose that is usually used to destroy a population of white bacteria.

Day 4 ⇒ Black bacteria got to survive a produce a big population. Remember that bacteria follow the exponential growth model, meaning that their reproductive rate is too high. This black population survived the antibiotic action and reproduced at high rates.

6 0

3 years ago

20 points! Please answer ASAP! Thank you!

Klio2033 [76]

Answer:

1. Thermostat.

2. Work out of.

3. Non-renewable.

4. Renewable resources.

5. Conservativism.

6. Non-renewable resources.

7. The reason Nation A might have trouble getting that resource from Nation B could be due to lack of funds (insufficient money) to acquire it, competition for the same resource by other nations, weak bargaining power of Nation A, ability to pay more money by other nations, Nation A and Nation B might be in conflict, tariffs and quotas, etc.

Explanation:

Energy can be defined as the ability (capacity) to do work. The various forms of energy are solar energy, electrical energy, chemical energy, thermal energy, wind energy, nuclear energy etc.

The Law of Conservation of Energy states that energy cannot be destroyed but can only be transformed or converted from one form to another.

Renewable energy is also known as clean energy and it can be defined as a type of energy that are generated through natural sources or technology-based processes that are replenished constantly. Some examples of these natural sources are water (hydropower), wind (wind energy), sun (solar power), geothermal, biomass, waves etc.

Basically, a renewable energy source is sustainable and as such can not be exhausted.

On the other hand, a non-renewable energy refers to an energy source such as fossil fuels that takes a very long time to be created or their creation happened long ago and isn't likely to happen again e.g uranium. Fossil fuels, such as coal, oil, and natural gas, come from deep inside the Earth where they formed over millions of years ago.

Filling the missing words or texts into questions, we have;

1. Set thermostat to automatically turn off heat or air conditioning when buildings are closed to conserve energy.

2. Energy can be used more efficiently getting more work out of each unit of energy.

3. Materials, such as gravel and sand, are technically non-renewable but there is so much of the available that we are unlikely to ever run out.

4. Renewable resources can be regenerated or grow so rapidly that they reappear at the same rate or faster than they are used.

5. When we practice conservatism we make sure resources will be available in the future.

6. Non-renewable resources are resources that cannot be regenerated on a useful timescale.

7. The reason Nation A might have trouble getting that resource from Nation B could be due to lack of funds (insufficient money) to acquire it, competition for the same resource by other nations, weak bargaining power of Nation A, ability to pay more money by other nations, Nation A and Nation B might be in conflict, tariffs and quotas, etc.

6 0

3 years ago