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2 years ago

Which statement about work and power correctly describes an automobile race?

Physics

2 answers:

Diano4ka-milaya [45]2 years ago

8 0

Answer: "The car that finishes last has the lowest power."

miv72 [106K]2 years ago

7 0

Well this question looks like it makes some assumptions. So assuming that both cars have the same mass and experience the same wind resistance regardless of speed and same internal frictions, then we could say "The car that finishes last has the lowest power". The reason is that for a given race the cars must overcome losses associated with motion. Since they all travel the same distance, the amount of work will be the same for both. This is because work is force times distance. If the force applied is the same in both cases (identical cars with constant wind resistance) and the distance is the same for both (a fair race track) then W=F·d will be the same.
Power, however, is the work done divided by the time over which it is done. So for a slower car, time t will be larger. The power ratio W/t will be smaller for the longer time (slower car).

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A radiometer can be used to determine the position of an approaching hot object by measuring the amount of irradiation it detect

forsale [732]

Answer:

The Position of the object L = 0.172 m

Explanation:

The detailed explanation of the question is given in the attach document.

3 0

2 years ago

(a). The largest building in the world by volume is the boeing 747 plant in Everett, Washington. It measures approximately 631m

lions [1.4K]

Explanation:

Given that,

Length of the building, l = 631 m

Breadth of the building, b = 707 yards

Height of the building, h = 110 ft

1 meter = 3.28084 feet

631 m = 2070.21 feet

1 yard= 3 feet

707 yards = 2121 feet

(a) The volume of any cuboidal shape is given by :

$V=l\times b\times h$

$V=2070.21\ ft\times 2121\ ft\times 110\ ft$

$V=4.83\times 10^8\ ft^3$

(b) $V=4.83\times 10^8\ ft^3$

$V=(4.83\times 10^8\ ft^3)(\dfrac{1\ m}{3.281\ ft})^3$

$V=1.37\times 10^7\ m^3$

Hence, this is the required solution.

3 0

2 years ago

In order for the ball to be able to make a complete circle around the peg, there must be sufficient speed at the top of its arc

Vesna [10]

Answer:

Explanation:

Let T be the tension in the swing

At top point $mg-T=\frac{mv^2}{r}$

where v=velocity needed to complete circular path

r=distance between point of rotation to the ball center=L+\frac{d}{2} (d=diameter of ball)

Th-resold velocity is given by $mg-0=\frac{mv^2}{r}$

To get the velocity at bottom conserve energy at Top and bottom

At top $E_T=mg\times 2L+\frac{mv^2}{2}$

Energy at Bottom $E_b=\frac{mv_0^2}{2}$

Comparing two as energy is conserved

$v_0^2=4gr+gr$

$v_0^2=5gr$

$v_0=\sqrt{5gr}$

$v_0=\sqrt{5g\left ( \frac{d}{2}+L\right )}$

6 0

2 years ago

Okno okrętu podwodnego ma powierzchnię 0,3 m2 i znajduje się na głębokości, na której ciśnienie wywierane przez słup wody wynosi

muminat

Answer:

Wartość siły nacisku wody na okno wynosi 150000 N.

The value of the water pressure force on the window is 150,000 N.

Explanation:

Kompletne pytanie

Okno okrętu podwodnego ma powierzchnię 0,3 m2 i znajduje się na głębokości, na której ciśnienie wywierane przez słup wody wynosi 500 kPa. Dokończ zdanie. Wartość siły parcia wody na okno wynosi.

Rozwiązanie

Ciśnienie wywierane przez siłę na pole powierzchni prostopadłe do linii działania tej siły jest określone wzorem

P = (F / A)

gdzie F = przyłożona siła, w tym przypadku siła nacisku wody na okno =?

A = Obszar, na który działa siła = Powierzchnia okna = 0,3 m²

P = 500 kPa = 500000 Pa

500,000 = (F/0.3)

F = 500,000 × 0.3 = 150,000 N

Mam nadzieję że to pomoże!!!

Complete Question In English

The submarine window has an area of 0.3 m2 and is located at a depth at which the pressure exerted by the water column is 500 kPa. Finish the sentence. The value of the water pressure force on the window is.

Solution

Pressure exerted by a force on a surface area perpendicular to the line of action of that force is given by the formula

P = (F/A)

where F = applied force, in this case, water pressure force on the window = ?

A = Area upon which the force is acting = Area of the window = 0.3 m²

P = 500 kPa = 500,000 Pa

500,000 = (F/0.3)

F = 500,000 × 0.3 = 150,000 N

Hope this Helps!!!

6 0

2 years ago

In which atmosphere layer does 80 percent of the gas in the atmosphere<br> reside?

VladimirAG [237]

Answer: TheTroposphere contains 80% of the total gas in the atmosphere

7 0

2 years ago

Read 2 more answers