Physics College

1. A person weighs 155 lbs and is walking 3.1 miles per hour. How much kinetic energy does the person have? (Keep in mind, 1 kg is 2.2 lb, and 1 m/s is 2.24 mi/h.)2. What is the kinetic energy of a 5 g bullet travelling 400 m/s?
3. Is it possible to have a negative KE? Why or why not?

Answers

Answer 1

Answer:

Explanation:

Kinetic energy is expressed as;

KE =1/2 mv²

M is the mass

v is the velocity of the object

1) Given

Mass = 155lb

Velocity = 3.1mi/hr

Since 1kg = 2.2lb

x = 155lb

x= 155/2.2

x = 70.45kg

Also

1m/s = 2.24mi/hr

y = 3.1mi/hr

y = 3.1/2.24

y = 1.384m/s

KE = 1/2(70.45)(1.384)²

KE = 0.9577×70.45

KE = 67.47Joules

2) M = 5g =0.005kg

V = 400m/s

KE = 1/2(0.005)400²

KE = 80000×0.005

KE = 400Joules

3} Since a body decelerates (negative acceleration) this mean that the velocity of a body can be a negative value showing that it is possible for a moving body to possess negative kinetic energy.

Related Questions

A current of 15 Amps flows through a circuit with a resistance of 0.10 Ohms. What is the voltage?
A. 0.006 Volts
OB. 1.5 Volts
O C. 15 Volts
D. 150 Volts

Answers

Voltage = (current) x (resistance) (Ohm's law)

Voltage = (15 A) x (0.10 ohm)

Voltage =  1.5 volts (B)

Other Questions
Poooo sieieoleltlrllrlr 1) The entire nation seemed to be drowning in debt.What rhetorical device is used in this sentence?A) anaphoraB) hyperbolemetaphorD)metonymyE)simile This informational reference usually provides information covering one calendar year.---a.Atlasc.Encyclopediab.Dictionaryd.None of these how do you do this? plz help me with math! The table shows the total number of ships and planes two countries couldeach produce if they fully devoted their economic resources to producing oneor the other. The data in the table most support which conclusion?Number of ships producedper dayNumber of planes producedper dayCountry A10050Country B6020 Describe how sodium (Na) and chlorine (Cl) interact to form an ionic compound. Specifically, what is happening to an electron? This is a science question. What is the acceleration of this helicopter? Solve the problem. Show your work Which word correctly completes this sentence?Casey won the contest; ______, he became famous. A. althoughB. howeverC. nevertheless D. therefore Find the equation of the parabola with a focus at the point (2,5), and a directrix of y = 3. . A person weighing 120 pounds has about 20 pints of blood in their body. Which equation below represents the relationship between pints of blood, b, to a person's weight, w? to calculatw the power produced by a force, the size of the force must be known. What else needs to be known to calculate the power 9. If f(x) = 5x-4 and f(2a) =156 , then what is the value of a? Determine the slope of the line that passes through the points M(-3,5) and N(1,8). Represent the slope in decimal form. I WILL MARK BRAINLIST sex linked traits are typically carried on the x chromosome. to denote the geontypes, a superscript is used. a female carrier of hemophillia will have the genotype xH Xh . using the letters X AND Y , what is the genotype for each of the following people? Irfan runs a small business. His businesss total liabilities amount to $200,000. His net profit for the latest accounting period is $50,000. The total value of all the business assets comes to $600,000. What is the debt to asset ratio in the case of Irfans business? The debt to assets ratio of Irfans business, to two decimal places, is percent. How were the Mauryan and Gupta empires alike?a. both invaded Chinab. both sent Buddhist missionaries to distant landsc. both treated other religions with toleranced. both were led by Hindu rulers The ideal hash function:A. Should be unfeasible to find two inputs that map to the same outputB. Should be unfeasible to learn anything about the input from the outputC. Basically we dont want people to figure out what was saidD. All the above 1o Divide $ 20,000 in the ratio 3:2