Physics

How many centimeters are there in a length 80.9 inches ? Express your answer in centimeters to three significant figures.

Inch = 2.54 cm 2.54/1 * 80.9/1 = 205.486 = 205

Found with a tangent line to a position vs time graph

Instantaneous velocity Vx=lim Delta x /Delta t Occurs during acceleration where the slope instantaneously becomes zero in order to move in the opposite direction

Describes the movement of the object in one dimension and two dimensions

Kinematics

Average velocity

aav, x = v2 - v1/t2 - t1 = vx/t m/(s^2)

Sign is (+) when accelerating or decelerating

accelerating

#14

chegg.com/homework-help/questions-and-answers/riding-bus-traveling-highway-notice-takes-2-min-travel-one-roadside-mile-marker-next-one-s-q10080461

Sign is (-) when accelerating or decelerating

decelerating

What is the x component of A⃗ A→? Express your answer to the nearest integer.

https://media.physicsisbeautiful.com/resources/2019/02/09/MasteringPhysics__Components_of_Vectors.pdf Vectors are the same when lines travel in the same direction When collecting X and Y values of component x and y values only that the count from the end points of the line and not the graph.

#30

https://www.chegg.com/homework-help/car-traveling-60-mi-h-highway-magnitude-acceleration-need-co-chapter-2-problem-30p-solution-9780321902788-exc

On the average, what volume of blood, in liters, does the heart pump during each beat? Express your answer in liters.

https://www.chegg.com/homework-help/college-physics-plus-masteringphysics-with-etext-access-card-package-10th-edition-chapter-1-problem-50gp-solution-9780321902566?trackid=ac4992b4656b&strackid=fb0248bfc74a

On the average, what volume of blood, in cubic centimeters, does the heart pump during each beat? Express your answer in cubic centimeters.

https://www.chegg.com/homework-help/college-physics-volume-1-chs.-1-16-10th-edition-chapter-1-problem-50gp-solution-9780134151779?trackid=c1f195b1f166&strackid=8217ee21a64f

#8

https://www.chegg.com/homework-help/family-trip-family-take-trip-see-aunt-lives-100-miles-away-a-chapter-2-problem-8p-solution-9780321902788-exc

If a flea can jump straight up to a height of 22 cm, what is its initial speed (m/s) as it leaves the ground, neglecting air resistance? B. How long is it in the air. C. What are the magnitude and direction of its acceleration while it is moving upward? downwards? at the highest point

https://www.chegg.com/homework-help/flea-jump-straight-height-220-cm-initial-speed-m-s-leaves-gr-chapter-2-problem-46p-solution-9781292112541-exc

a.) The recommended daily allowance (RDA) of the trace metal magnesium is 410 mg/day for males. Express this quantity in ?g/day . b.) For adults, the RDA of the amino acid lysine is 12 mg per kg of body weight. How many grams per day should a 79kg adult receive? c.) A typical multivitamin tablet can contain 2.0 mg of vitamin B2 (riboflavin), and the RDA is 0.0030 g/day . How many such tablets should a person take each day to get the proper amount of this vitamin, assuming that he gets none from any other sources? d.) The RDA for the trace element selenium is 0.000070 g/day . Express this dose in mg/day .

https://www.chegg.com/homework-help/questions-and-answers/-recommended-daily-allowance-rda-trace-metal-magnesium-410-mg-day-males-express-quantity-g-q7229995

Approximately what is the mass of an average cell?

https://www.chegg.com/homework-help/questions-and-answers/although-sizes-vary-cells-modeled-spheres-200-m-diameter-average-approximately-mass-averag-q23654323

#52

https://www.chegg.com/homework-help/questions-and-answers/astronauts-moon-must-function-acceleration-due-gravity-0170--astronaut-throw-certain-wrenc-q1318320

Cheetahs, the fastest of the great cats, can reach 45mph in 2.0s starting from rest. Assume that they have constant acceleration throughout that time.Q: Find their acceleration in m/s

https://www.chegg.com/homework-help/questions-and-answers/cheetahs-fastest-great-cats-reach-45mph-20s-starting-rest-assume-constant-acceleration-thr-q2554811

What is the mass of 5.00 LL of pure water? Express your answer in grams. What is the mass of 5.00 LL of whole blood? What is the mass of 5.00 LL of seawater?

https://www.chegg.com/homework-help/questions-and-answers/density-mass-divided-volume-pure-water-100-g-cm-3-whole-blood-105-g-cm-3-density-seawater--q23512965

#26

https://www.chegg.com/homework-help/questions-and-answers/driver-car-traveling-highway-suddenly-slams-brakes-slowdown-traffic-ahead-car-s-speed-decr-q23758972

The Beretta Model 92S (the standard-issue U.S. army pistol) has a barrel 127 {\rm mm} long. The bullets leave this barrel with a muzzle velocity of 348 m/s. What is the acceleration of the bullet while it is in the barrel, assuming it to be constant? Express your answer in m/s^2. What is the acceleration of the bullet while it is in the barrel, assuming it to be constant? Express your answer in g's. For how long is the bullet in the barrel?

https://www.chegg.com/homework-help/questions-and-answers/faster-speeding-bullet-beretta-model-92s-standard-issue-us-army-pistol-barrel-127-mm-long--q2844062

Gravity causes objects to be attracted to one another. This attraction keeps our feet firmly planted on the ground and causes the moon to orbit the earth. The force of gravitational attraction is represented by the equation F=Gm1m2r2F=Gm1m2r2, where FFF is the magnitude of the gravitational attraction on either body, m1m1m_1 and m2m2m_2 are the masses of the bodies, rrr is the distance between them, and GGG is the gravitational constant. In SI units, the units of force are kg⋅m/s2kg⋅m/s2, the units of mass are kgkg, and the units of distance are mm. For this equation to have consistent units, the units of GGG must be which of the following?

https://www.chegg.com/homework-help/questions-and-answers/gravity-causes-objects-attracted-one-another-attraction-keeps-feet-firmly-planted-ground-c-q1349834

If the vector B⃗ B→ has a magnitude of 30 mm and makes an angle of 45 ∘∘ with the +x+x axis, the vector -B⃗

https://www.chegg.com/homework-help/questions-and-answers/item-9-part-vector-b-magnitude-30-m-makes-angle-45-axis-vector-b-o-makes-angle-45-axis-o-o-q44854524?trackid=6195052ad5c7&strackid=2225f1c36196

A ladybug starts at the center of a 12 inch diameter turntable and crawls in a straight radial line to the edge. While this happening the turn table turns through a 45 degree angle. Find the direction of the ladybug's displacement vector.

https://www.chegg.com/homework-help/questions-and-answers/ladybug-starts-center-120--diameter-turntable-crawls-straight-radial-line-edge-happening-t-q8089101 A) The Diameter of the turntable is 12 inch so the radius r = D/2 = 12/2 = 6 inches Since the lady bug moves from the center to the edge, the displacement is equal to the radius in magnitude S = r = 6 inches B) Let us say the lady bug is moving in positive x axis initially, so the lady bug must have moved an angle of 45° degrees when it reached the edge of the turntable. θ = 45° - 0° θ = 45°

About how many cells does a typical human contain?

https://www.chegg.com/homework-help/questions-and-answers/many-cells-typical-human-contain-~-2-10-10-cells-~-2-10-16-cells-~-2-10-22-cells-~-2-10-24-q1317680

Find the components of the vector A⃗ A→A_vec with length aaa = 1.00 and angle αα=20.0 ∘∘ with respect to the x axis as shown in (Figure 1). Enter numerically, separated by a comma, the x component followed by the y component. Find the components of the vector B⃗ B→B_vec with length bbb = 1.00 and angle ββ=20.0 ∘∘ with respect to the x axis as shown in (Figure 1). Enter numerically, separated by a comma, the x component followed by the y component. Find the components of the vector C⃗ C→C_vec with length ccc = 1.00 and angle ϕ=ϕ= 25.0 ∘∘ as shown in (Figure 1). Enter numerically, separated by a comma, the x component followed by the y component.

https://www.chegg.com/homework-help/questions-and-answers/often-vector-specified-magnitude-direction-example-rope-tension-t-exerts-force-magnitude-t-q30731087?trackid=9cdb64255d76&strackid=c53d5e280d3b

One consequence of Einstein's theory of special relativity is that mass is a form of energy. This mass-energy relationship is perhaps the most famous of all physics equations: E=mc2E=mc2, where mmm is mass, ccc is the speed of the light, and EEE is the energy. In SI units, the units of speed are m/sm/s. For the preceding equation to have consistent units (the same units on both sides of the equation), the units of EEE must be which of the following?

https://www.chegg.com/homework-help/questions-and-answers/one-consequence-einstein-s-theory-special-relativity-mass-form-energy-mass-energy-relation-q1933621

Compute the x and y components of vector A⃗ A→. Express your answers in meters to three siginificant figures. Enter your answers separated by a comma.

https://www.chegg.com/homework-help/questions-and-answers/question-1-parts-c-compute-x-y-components-three-vectors-q53072304 Sin is opposite of the angle (Sin is opposite/bad) Cos is adjacent to the angle Multiply Cos or Sin * Angle 1st then by the component

What is the speed of a car going v=1.000mphv=1.000mph in SI units? Notice that you will need to change from miles to meters and from hours to seconds. You can do each conversion separately. Use the facts that 1mile=1609m1mile=1609m and 1hour=3600s1hour=3600s. Express your answer in meters per second to four significant figures.

https://www.chegg.com/homework-help/questions-and-answers/speed-car-going-v-1000mph-si-units-notice-need-change-miles-meters-hours-seconds-conversio-q8158081

Which two vectors, when added, will have the largest (positive) x component?

https://www.chegg.com/homework-help/questions-and-answers/two-vectors-added-largest-positive-x-componet-1-c-e-2-e-f-3-f-4-c-d-5-b-d-two-vectors-adde-q2845404

#54

https://www.chegg.com/homework-help/rock-thrown-vertically-upward-speed-120-m-s-roof-building-60-chapter-2-problem-57p-solution-9780321778239-exc

36)A rocket fires two engines simultaneously. One produces a thrust of 725 N directly forward, while the other gives a 513−N thrust at 32.4∘ above the forward, while the other gives a 513−N and direction (relative to the forward direction) of the resultant force that these engines exert on the rocket.

https://www.chegg.com/homework-help/rocket-fires-two-engines-simultaneously-one-produces-thrust-chapter-1-problem-39p-solution-9780321778239-exc https://www.numerade.com/questions/a-rocket-fires-two-engines-simultaneously-one-produces-a-thrust-of-480-mathrmn-directly-forward-whil/ 2 forces on the X - Axis 1 force on the Y axis

On a single diagram, carefully sketch each force vector to scale and identify its magnitude and direction on your drawing: (a) 60 lb at 25∘ east of north. (b) 40 lb at π/3 south of west.(c) 100 lb at 40∘40∘ north of west. (d) 50 lb at π/6π/6 east of south.

https://www.chegg.com/homework-help/single-diagram-carefully-sketch-force-vector-scale-identify-chapter-1-problem-31p-solution-9780321902788-exc https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:radians/v/we-converting-radians-to-degrees https://www.khanacademy.org/math/algebra2/x2ec2f6f830c9fb89:trig/x2ec2f6f830c9fb89:radians/e/degrees_to_radians 1 radian = 180 degrees

#48

https://www.chegg.com/homework-help/world-s-tallest-building-suppose-drop-marble-top-burj-khalif-chapter-2-problem-48p-solution-9780321902788-exc

#47

https://www.numerade.com/questions/a-brick-is-released-with-no-initial-speed-from-the-roof-of-a-building-and-strikes-the-ground-in-250-/

#28

https://www.numerade.com/questions/a-cat-drops-from-a-shelf-40-ft-above-the-floor-and-lands-on-all-four-feet-his-legs-bring-him-to-a-st/

A dogruns frompoints AA to BB to CC in 3.0 s. (See Figure 2.41.)2.41.) Find the dog's average velocity and average speed over this 3−3− second interval.

https://www.numerade.com/questions/a-dogruns-frompoints-a-to-b-to-c-in-30-s-see-figure-241-find-the-dogs-average-velocity-and-average-s/

(a) How many ohms are there in a 7.85 megohm resistor?(b) Typical laboratory capacitors are around 5 picofarads. How many farads are they? (c) The speed of light in vacuum is 3.00×10^8m/s Express this speed in gigameters per second. (d) The wavelength of visible light is between 400 nm and 700 nm. Express this wavelength in meters. (e) The diameter of a typical atomic nucleus is about 2 femtometers. Express this diameter in meters.

https://www.numerade.com/questions/a-how-many-ohms-are-there-in-a-785-megohm-resistor-b-typical-laboratory-capacitors-are-around-5-pico/ Pico = 10^-12 Nano = 10^-9 Micro = 10^-6 Milli = 10^-3 Kilo = 10^3 Meg = 10 ^ 6 Giga = 10 ^ 9 Tera = 10 ^ 12

#46

https://www.numerade.com/questions/a-if-a-flea-can-jump-straight-up-to-a-height-of-220-mathrmcm-what-is-its-initial-speed-in-mathrmm-ma/

#29

https://www.numerade.com/questions/a-jet-fighter-pilot-wishes-to-accelerate-from-rest-at-a-constant-acceleration-of-5g-to-reach-mach--2/

A plane leaves Seattle, flies 85 mi at 22 degrees north of east, and then changes direction to 48 degrees south of east. After flying at 115 mi in this new direction, the pilot must make an emergency landing on a field. The sSeattle airport facility dispatches a rescue crew. a) In what direction and how far should the crew fly to go directly to the field? Use components to solve this problem. b) check the reasonableness of your answer with a careful graphical sum.

https://www.numerade.com/questions/a-plane-leaves-seattle-flies-85-mi-at-22circ-north-of-east-and-then-changes-direction-to-48circ-sout/

#49

https://www.numerade.com/questions/a-tennis-ball-on-mars-where-the-acceleration-due-to-gravity-is-0379g-and-air-resistance-is-negligibl/

An ant is crawling along a straight wire, which we shall call the xx axis, from AA to BB to CC to DD (which overlaps A),A), as shown in Figure 2.39.O2.39.O is the origin. Suppose you take measurements and find that ABAB is 50cm,BC50cm,BC is 30cm,30cm, and AOAO is 5 cmcm . (a) What is the ant's position at points A,B,C,A,B,C, and D?D? (b) Find the displacement of the ant and the distance it has moved over each of the following intervals: (i) from AA to B,B, (ii) from BB to C,C, (iii) from CC to D,D, and (iv) from AA to DD .

https://www.numerade.com/questions/an-ant-is-crawling-along-a-straight-wire-which-we-shall-call-the-x-axis-from-a-to-b-to-c-to-d-which-/

#27

https://www.numerade.com/questions/animal-motion-cheetahs-the-fastest-of-the-great-cats-can-reach-45-mph-in-20-starting-from-rest-assum/

39

https://www.numerade.com/questions/bullet-a-woman-takes-her-dog-rover-for-a-walk-on-a-leash-to-get-the-little-pooch-moving-forward-she-/

37)In each of the cases that follow, the magnitude of a vector is given along with the counterclockwise angle it makes with the +x axis. Us trigonometry to find the x and y components of the vector. Also, sketch each vector approximately to scale to see if your calculated answers seem reasonable.

https://www.numerade.com/questions/cdot-in-each-of-the-cases-that-follow-the-magnitude-of-a-vector-is-given-along-with-the-counterclock/

#9

https://www.numerade.com/questions/hypersonic-scramjet-on-march-272004-the-united-states-successfully-tested-the-hypersonic-mathrmx-43-/

40.

https://www.numerade.com/questions/if-a-vector-veca-has-the-following-components-use-trigonometry-to-find-its-magnitude-and-the-counter/

#50

https://www.numerade.com/questions/measuring-g-one-way-to-measure-g-on-another-planet-or-moon-by-remote-sensing-is-to-measure-how-long-/

#13

https://www.numerade.com/questions/ouch-nerve-impulses-travel-at-different-speeds-depending-on-the-type-of-fiber-through-which-they-mov/

#10

https://www.numerade.com/questions/plate-tectonics-the-earths-crust-is-broken-up-into-a-series-of-more-or-less-rigid-plates-that-slide-/

Suppose that a particular artillery piece has a range RRR = 9760 yardsyards . Find its range in miles. Use the facts that 1mile=5280ft1mile=5280ft and 3ft=1yard3ft=1yard. Express your answer in miles to three significant figures.

1/5280 * 3/1 * 9760/1 = 5.55

Which of the following quantities has units of displacement ?

40 km southwest

Distance from here to there (initial to final point) Final - Initial

Displacement (cm)

Study of why an object is moving

Dynamics

A person is walking briskly in a straight line, which we shall call the xx axis. Figure 2.40 shows a graph of the person's position xx along this axis as a function of time tt (a) What is the person's displacement during each of the following time intervals: (i) between t=1.0st=1.0s and t=10.0s,t=10.0s, (ii) between t=3.0st=3.0s and t=10.0s,(t=10.0s,( iii) between t=2.0st=2.0s and t=3.0st=3.0s and (iv) between t=2.0st=2.0s and t=4.0s?t=4.0s? (b) What distance did the person move from (i) t=0t=0 s to t=4.0st=4.0s , (ii) t=2.0st=2.0s to t=4.0s,t=4.0s, and (ii) t=8.0st=8.0s to t=10.0s?t=10.0s?

numerade.com/questions/a-person-is-walking-briskly-in-a-straight-line-which-we-shall-call-the-x-axis-figure-240-shows-a-gra/

Velocity

x2 - x1/t2 - t1 = x/t (m/s) Slope = Average velocity