PHYSICS HIGH SCHOOL

What is the kinetic energy of a 108 kg object that is moving with a speed of 11.1 m/s ?

Answers

Answer 1

Answer:

Answer:

6,653.34 J

Explanation:

Kinetic energy can be found using the following formula.

$KE=(1)/(2) mv^2$

where m is the mass in kilograms and v is the velocity in m/s.

The object is 108 kilograms and is moving at a speed of 11.1 m/s. Therefore, the mass is 108 kg and the velocity is 11.1 m/s.

m=108 kg

v=11.1 m/s

Substitute these values into the formula.

$KE=(1)/(2)*108*11.1^2$

Evaluate the exponent first. 11.1^2 is the same as 11.1*1.11, which is equal to 123.21

$KE=(1)/(2) *108*123.21$

Multiply 108 and 123.21

$KE=(1)/(2)*13306.68$

Multiply 1/2 and 13306.68

$KE=6653.34$

The kinetic energy of the object is 6,653.34 Joules (kg m2/s^2)

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after the box has left the rubber band but is still moving upward, what is the passenger's apparent weight?

Answers

If the upward acceleration is equal to the acceleration due to gravity ( $9.8 m/s^2$ ), then the apparent weight would be zero, indicating that the passenger is experiencing weightlessness or is in a state of free fall.

When the box has left the rubber band but is still moving upward, the passenger's apparent weight would be less than their actual weight.

The apparent weight of an object is the force exerted on it by a supporting surface, which in this case is the floor of the box. It is equal to the normal force acting on the object.

As the box accelerates upward, there are two main forces acting on the passenger: the gravitational force (weight) pulling them downward and the normal force pushing them upward. The normal force is responsible for providing the upward acceleration to the passenger.

Since the passenger is moving upward, the normal force exerted by the floor must be less than their actual weight to create the net upward force necessary for upward acceleration. Therefore, the passenger's apparent weight is reduced.

The exact value of the apparent weight depends on the magnitude of the upward acceleration and the mass of the passenger. The apparent weight can be calculated using the equation:

Apparent weight = Actual weight - (Mass of passenger * Magnitude of upward acceleration)

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Force is applied to an object and the object is moved over a distance in the same direction of the applied force" is the definition of (2 points)a. balanced force.
b. gravitational force.
c. power.
d. work

Answers

Answer:

The correct answer to your question is B. Gravitational force because the force is applied to one object as it is applied to the same direction.

Explanation:

its not work!!!

plz if you don"t know n answer to a question don"t answer it i could hurt others grade. brainly is for helping other not putting wrong answer and make the person get a bad grade

im just saying :)

Answer: IT IS NOT GRAVITATIONAL FORCE; I think it’s work

Explanation:

I put gravitational force and got it wrong

Mike has a mass of 97 kg. He jumps out of a perfectly good airplane that is 2000 m above the ground. After he falls 1000 m, when his downward speed is 68 m/s, Mike opens his parachute. The positive y-direction is downward.(a) Calculate the average magnitude of the upward force of the air resistance on Mike during his initial descent.

(b) After Mike opens his parachute, he continues to descend, eventually reaching the ground with a speed of 4.0 m/s. Calculate the average upward force during this part of Mike's descent.

(c) At the same time Mike jumps out of the airplane, his wallet (mass of 0.3 kg) falls out of his pocket. Calculate the wallet's downward speed when it reaches the ground. For this calculation, assume that air resistance is negligible.

Answers

Final answer:

The average magnitude of the upward force of air resistance on Mike during his initial descent is 0 N. The average upward force during the descent after Mike opens his parachute is 1.552 N. The downward speed of the wallet when it reaches the ground is 196.196 m/s.

Explanation:

(a) Average magnitude of the upward force of air resistance:

To find the average magnitude of the upward force of air resistance during Mike's initial descent, we need to calculate the net force acting on him. This can be done by subtracting his weight from the gravitational force:

Net force = gravitational force - weight

Gravitational force = mass * acceleration due to gravity = 97 kg * 9.8 m/s2 = 950.6 N

Weight = mass * acceleration due to gravity = 97 kg * 9.8 m/s2 = 950.6 N

Net force = 950.6 N - 950.6 N = 0 N

Since the net force is 0 N, the average magnitude of the upward force of air resistance is also 0 N.

(b) Average upward force after opening parachute:

When Mike opens his parachute, air resistance plays a significant role in slowing him down. The average upward force can be calculated using the equation:

Average upward force = mass * acceleration

Acceleration = (final speed - initial speed) / time

Time = distance / (final speed - initial speed)

Acceleration = (4.0 m/s - 68 m/s) / (1000 m / (4.0 m/s - 68 m/s)) = 0.016 m/s2

Average upward force = 97 kg * 0.016 m/s2 = 1.552 N

(c) Speed of the wallet:

Since the wallet has negligible air resistance, we can use the equation for freefall to calculate its speed:

Final speed = initial speed + acceleration * time

Acceleration = acceleration due to gravity = 9.8 m/s2

Time = sqrt(2 * height / acceleration) = sqrt(2 * 2000 m / 9.8 m/s2) = 20.02 s

Initial speed = 0 m/s

Final speed = 0 m/s + 9.8 m/s2 * 20.02 s = 196.196 m/s

Therefore, the downward speed of the wallet when it reaches the ground is 196.196 m/s.

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Final answer:

The force of air resistance on Mike during his initial descent and after opening his parachute is approximately 950.6 N. Ignoring air resistance, his wallet will reach the ground at approximately 198 m/s.

Explanation:

The subject of this question is Physics, and it requires understanding of forces and kinematics to apply to the real world scenario of skydiving.

Part (a)

During the initial descent, Mike doesn't have a parachute open. So, the only forces at play initially are his weight and the force of air resistance. We know that he achieves a steady speed of 68 m/s, which means the forces are balanced (net force is zero). Since weight and air resistance counterbalance each other, we calculate the weight by multiplying mass (97 kg) by acceleration due to gravity (9.8 m/s2), which yields 950.6 N. Given the forces balance, this is also the force of air resistance and the answer to part (a).

Part (b)

After the parachute opens, Mike continues to descend, eventually reaching the ground with a speed of 4.0 m/s, indicating a different balance between weight and airresistance. The weight remains the same, but the air resistance (upward force) has increased and once again equals weight since there is no acceleration. Hence, the upward force is still 950.6 N.

Part (c)

For the wallet, we're told to ignore air resistance. So, it's a free fall scenario. We can use the equation of motion v2 = u2 + 2gs to calculate the final speed. Initial speed (u) is 0, g is 9.8 m/s2 and s (displacement) is 2000 m. Substituting these values in, we calculate a final speed of approximately 198 m/s.

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If you are asked to determine an object’s speed, what information must you have?A. distance and period of time

B. distance and change in position

C. period of time and direction

D. distance and direction

Answers

A) distance and period of time

The speed of an object is equal to the distance it travels divided by the amount of time it takes to travel the distance.

This measures the average speed

In the space below, explain why you agree or disagree with the first statement: Each person in a family has the same traits. There are no differences in traits between parents and offspring or among siblings.

Answers

Answer:

I disagree.

Explanation:

Yes, traits may be similar, but it all depends on the dominant and recessive alleles that are passed on. No one person can look alike. Even with twins, a widow's peak or close lobes can be different.

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In the steps of the scientific method, what is the next step after formulating and objectively testing hypotheses?A. interpreting resultsB. stating conclusionsC. conducting experimentsD. making observations and collecting data

Answers

Answer:

Option A

interpreting results

Explanation:

In a Scientific research, we first formulate and test hypothesis of the study. A hypothesis is a tentative guess in the study which should be validated in the process of the study. We may have a null and alternative hypothesis. After formulating the study, we conduct the actual study where we get raw data. The raw data is then analyzed, in many cases using statistical analysis tools such as R, python, excel spreadsheet etc. Therefore, the next step after formulating and objectively testing hypotheses is to interpret the results.

In the steps of the scientific method, the next step after formulating and objectively testing hypotheses is interpreting results.

Scientific method is an experimental method used in scientific research for evaluating a scientific hypothesis. The process of carrying out scientific method involves observation, then asking questions, followed by finding answers via carrying out experiments.

The steps involved in the carrying out scientific methods includes the following processes:

observation or asking question
research topic formulation
formulating hypothesis
testing hypothesis or experimentation
interpreting or analyzing result
report and conclusion

Therefore, we can conclude that in the steps of scientific methods, the next step after formulating hypotheses is interpreting results.

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