Physics, 21.05.2020 05:58 Loggtech24

1. Car Down Incline w Friction An automobile weighing 4250 lb starts from rest at point A on a 6o incline and coasts through a distance of 500 ft to point B. The brakes are then applied, causing the automobile to come to a stop at point C, 70 ft from B. Knowing that slipping is impending during the braking period and neglecting air resistance and rolling resistance, determine (a) the speed of the automobile at point B, (b) the coefficient of static friction between the tires and the road.

Answers: 3

Show answers

Answers

Answer from: IsabellaGracie

Explanation:

Let θ be the inclination

downward acceleration on an inclined plane

= g sinθ

= 32 x sin6

a = 3.345 ft /s

a ) for knowing the speed at point B

v² = u² + 2 a s , v is final velocity , u is initial velocity , a is acceleration and s is distance travelled .

v² = 0 + 2 x 3.345 x 500

= 3345

v = 57.8 ft /s

from point B to C , the car decelerates so we shall find deceleration

v² = u² + 2 a s

0 = 3345 + 2 x a x 70 ( v becomes u here )

a = - 23.9 m /s²

net force on car during deceleration

= μmgcosθ - mg sinθ where μ is coefficient of static friction ,

= mg ( μcosθ - sinθ )

deceleration = g ( μcosθ - sinθ )

g ( μcosθ - sinθ ) = 23.9

( μcosθ - sinθ ) = .74

μcosθ = .74 + .104

= .8445

μ = .8445 / .9945

= .85 .

Answer from: Quest

Acetic acid /əˈsiːtɪk/, systematically named ethanoic acid /ˌɛθəˈnoʊɪk/, is a colourless liquid organic compound with the chemical formula ch3cooh (also written as ch3co2h or c2h4o2). when undiluted, it is sometimes called glacial acetic acid. vinegar is no less than 4% acetic acid by volume, making acetic acid the main component of vinegar apart from water. acetic acid has a distinctive sour taste and pungent smell. in addition to household vinegar, it is mainly produced as a precursor to polyvinyl acetate and cellulose acetate. it is classified as a weak acid since it only partially dissociates in solution, but concentrated acetic acid is corrosive and can attack the skin.acetic acidnamespreferred iupac nameacetic acidsystematic iupac nameethanoic acidother namesvinegar (when dilute); hydrogen acetate; methanecarboxylic acid[1][2]identifierscas number64-19-7 3d model (jsmol)interactive image3dmetb00009 reference506007chebichebi: 15366 chemblchembl539 chemspider171 drugbankdb03166 echa infocard100.000.528ec number200-580-7e numbere260 (preservatives)gmelin reference1380iuphar/bps1058keggd00010 meshacetic+acidpubchem cid176rtecs numberaf1225000uniiq40q9n063p un number2789inchiinchi=1s/c2h4o2/c1-2(3)4/h1h3,(h,3,4) key: qtbsbxvteameqo-uhfffaoysa-n smilescc(o)=o

Answer from: Quest

their crystal patterns have been disrupted by stress

Another question on Physics

Physics, 21.06.2019 23:00

1point) a skydiver weighing 130 lb (including equipment) falls vertically downward from an altitude of 14,000 ft and opens the parachute after 20 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.85|v|0.85|v| when the parachute is closed and is of magnitude 17|v|17|v| when the parachute is open, where the velocity vv is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. find the speed of the skydiver when the parachute opens. speed is 150.6121788 ft/s find the skydiver's height when the parachute opens. height is 2338.98591 ft find the limiting velocity vlvl after the parachute opens. (think about whether this should be positive or negative.) vl=vl= 7.647 ft/s

Answers: 2

Answer

Physics, 22.06.2019 06:50

What is the stall speed at sea level of an airplane that weights 10000 lbs., has a wing area of 300ft^2, and a maximum lift coefficient of 1.4? what is the stall speed if flaps that double cl,max are applied?

Answers: 1

Answer

Physics, 22.06.2019 07:00

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

Answers: 1

Answer

Physics, 22.06.2019 18:30

Suppose you plot the distance traveled by an object at various times and you discover that the graph is not a straight line. what does this indicate about the object's acceleration?

Answers: 3

Answer

You know the right answer?

1. Car Down Incline w Friction An automobile weighing 4250 lb starts from rest at point A on a 6o in...

Questions