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3 years ago

Darw a velocity time graph for body moving with uniform acceleration

Physics

1 answer:

Troyanec [42]3 years ago

7 0

Answer:

constant gradient rising

Explanation:

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John rode 3,150 m at an average speed of 350 m/min. If he

Vikentia [17]

Answer:

mabye 8

Explanation:

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3 years ago

In a science demonstration, a teacher mixed zinc (Zn) with hydrogen chloride (HCl) in a flask and quickly attached a balloon ove

Juliette [100K]

Answer:

Combustion reaction resulted in formation of Hydrogen gas.

Explanation:

When zinc and Hydrogen Chloride (HCl) are mixed together, it is a oxidation reduction process. To be specific, a combustion reaction takes place. It is an exothermic reaction. Exothermic reactions involve oxygen and generate . Here, due to this exothermic reaction, Hydrogen gas is being produced which results in the formation of bubble and inflation of balloon.

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3 years ago

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Last night, Shirley worked on her accounting homework for one and one half hours. During that time, she completed 6 problems. Wh

hodyreva [135]

Answer:

velocity in problems per hour = 4 per hour

so correct option is b. 4 per hour

Explanation:

given data

worked on homework time = 1.5 hour

completed = 6 problems

to find out

What is the velocity in problems per hour

solution

we know that Shirley solve complete 6 accounting homework problem in 1.5 hour so her velocity in problems per hour will be as

velocity in problems per hour = $\frac{complete\ problem}{time\ taken}$ ..................1

put here value we will get

velocity in problems per hour = $\frac{6}{1.5}$

velocity in problems per hour = 4 per hour

so correct option is b. 4 per hour

3 0

4 years ago

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Every year, new records in track and field events are recorded. Let's take an historic look back at some exciting races.

Hitman42 [59]

First we need to turn Aouita's time for the race into seconds. There are 60 seconds in a minute, so 7 minutes and 29.45 seconds is (7 x 60) + 29.45 = 449.45. He ran 3000 meters in that time, so his average speed was 3000 meters divided by 449.45 seconds. 3000 / 449.45 = 6.67 m/s. So, on average, he covered 6.67 meters (more than 21 feet!) during each second of the race.

4 0

3 years ago

A 12.0kg microwave oven is pushed 14.0m up the sloping surface of a loading ramp inclined at an angle 37 degrees above the horiz

Semenov [28]

Answer:

Answered

Explanation:

a) What is the work done on the oven by the force F?

W = F * x

W = 120 N * (14.0 cos(37))

<<<< (x component)

W = 1341.71

b) $F_f=\mu_k N$

$F_f=0.25\times12\times9.8$

= 29.4 N

$W_f= F_f\times x$

$W_f= 29.0\times 14 cos(37)$

W_f= 328.72 J = 329 J

c) increase in the internal energy

U_2 = mgh

= 12*9.81*14sin(37)

= 991 J

d) the increase in oven's kinetic energy

U_1 + K_1 + W_other = U_2 + K_2

0 + 0 + (W_F - W_f ) = U_2 + K_2

1341.71 J - 329 J - 991 J = K_2

K_2 = 21.71 J

e) F - F_f = ma

(120N - 29.4N ) / 12.0kg = a

a = 7.55m/s^2

vf^2 = v0^2 + 2ax

vf^2 = 2(7.55m/s)(14.0m)

V_f = 14.5396m/s

K = 1/2(mv^2)

K = 1/2(12.0kg)(14.5396m/s)

K = 87.238J

4 0

3 years ago