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zmey [24]
3 years ago
8

What statement best explains their findings? A) The downward force of gravity is less on the notecard because it has less mass.

B) The upward force of friction is greater on the notecard than the other objects. C) The upward force of air resistance is greater with the notecard causing it to reach the ground slower. D) There was an error in the experiment. All of the objects will reach the ground at the same time due to equal gravitational pull.
Physics
1 answer:
inysia [295]3 years ago
3 0

Answer:

C) The upward force of air resistance is greater with the note card causing it to reach the ground slower.

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An airplane increases its velocity from 60m/s to 80m/s in a time of 10s.
Elenna [48]

\huge\fbox{Answer ☘}

acceleration \:  =  \frac{v - u}{t}  \\  =  >  \frac{80 - 60}{10}  \\ \\   =  >  \frac{20}{10}  \\  \\  =  > 2m \: s {}^{ - 2}

hope helpful ~

4 0
2 years ago
Which of these statements are true?
Juliette [100K]
D.Neither High- nor low-pressure systems lead to rain
8 0
3 years ago
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Mation about your sour
Ann [662]

(#1). (D).

(#2). (C).

8 0
3 years ago
A 3 kg bowling ball is thrown onto a mattress. If it takes 0.3 seconds to stop the ball using a force of 24 N, what was the init
enyata [817]

Answer:

-24 m/s

Explanation:

mass of the bowling ball =  3 kg

time (t) = 0.3 seconds

Force = 24 N

initial velocity u = ???

We know that;

Force = mass × acceleration (a)

So;

24 = 3 × a

a = 24/3

a = 8 m/s²

Also;

From equation of motion; acceleration is given by the relation;

a =\frac{v-u}{t}

if v = 0

then ;

8 = \frac{0-u}{0.3}

24 = 0- u

u = -24 m/s

Thus; the  initial velocity of the bowling ball when it first touched the mattress =  -24 m/s

7 0
3 years ago
A river flowing steadily at a rate of 175 m3/s is considered for hydroelectric power generation. It is determined that a dam can
Alex_Xolod [135]

Answer:

137200000 watts or 137200 kilowatts

Explanation:

The formula for power is P= dhrg

Where P = Power in watts

d = density of water (1000 kg/m^3)

h = height in meters

r = flow rate in cubic meters per second,

g = acceleration due to gravity of 9.8 m/s^2,

Plugging in the known values,

we get

P = 1000 kg/m^3 * 80 m * 175 m^3/s * 9.8 m/s^2

P = 80000 kg/m^2 * 175 m^3/s * 9.8 m/s^2

P = 14000000 kg m/s * 9.8 m/s^2

P = 137200000 kg m^2/s^3

P = 137200000 watts or 137200 kilowatts

The above figure assumes 100% efficiency which is impossible. A good efficiency would be 90% so the actual power available would be close to 0.90 * 137200 = 123480 kilowatts

6 0
3 years ago
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