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3 years ago

14

What is the acceleration of a softball if it has a mass of 0.19 kg and hits the catcher's glove with a force of 4.75 N? Answer:

m/s2

1 answer:

mr Goodwill [35]3 years ago

6 0

Using a=f/m it is 4.75/.19= 25m/s^2

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A minivan sells for 33,200 dollars. Give the price of the minivan in a) kilodollars and megadollars

amm1812

The prefix of a unit could give you a hint on its extent with respect to the base unit. In this case, the base unit is money in terms of dollars. When you say kilodollars, that would be 1,000 times as large as a dollar. Hence,

33,200 dollars * 1 kilodollar/ 1,000 dollars = 33.2 kilodollars

When you say megadollars, that would be a million times as large as a dollar. Hence,

33,200 dollars * 1 megadollar/1,000,000 dollars = 0.0332 megadollars

6 0

4 years ago

A janitor standing on the top floor of a building wishes to determine the depth of the elevator shaft. They drop a rock from res

Bumek [7]

Answer:

Part a)

H = 26.8 m

Part b)

error = 7.18 %

Explanation:

Part a)

As the stone is dropped from height H then time taken by it to hit the floor is given as

$t_1 = \sqrt{\frac{2H}{g}}$

now the sound will come back to the observer in the time

$t_2 = \frac{H}{v}$

so we will have

$t_1 + t_2 = 2.42$

$\sqrt{\frac{2H}{g}} + \frac{H}{v} = 2.42$

so we have

$\sqrt{\frac{2H}{9.81}} + \frac{H}{336} = 2.42$

solve above equation for H

$H = 26.8 m$

Part b)

If sound reflection part is ignored then in that case

$H = \frac{1}{2}gt^2$

$H = \frac{1}{2}(9.81)(2.42^2)$

$H = 28.7 m$

so here percentage error in height calculation is given as

$percentage = \frac{28.7 - 26.8}{26.8} \times 100$

$percentage = 7.18$

5 0

3 years ago

A migrating bird flew across a lake at an average speed of 18 meters per second. Was the distance that the bird flew across the

Natasha_Volkova [10]

Answer:

It cannot be said with 100% guarantee.

Explanation:

Since bird is travelling with 18 meters per second, that means that it covers a distance of 18 meters in 1 second.

for part 1 we convert 20 minutes into seconds, thus, 20 * 60 = 1200 seconds.

Distance covered in 1200 seconds will be:

S = v * t (S is distance , v is speed, t is time)

18 * 1200 = 21600 meters = 21.6 Kilometers

If the bird took less than 20 minutes than distance covered would be less than 21.6 Kilometer which could be greater than or lesser than 21 Kilometers. On average we can say that the distance bird travelled will be less than 21 Kilometer. But it is not definite.

For part B convert 0.4 hours into seconds to find the distance it travelled.

0.4 * 60 * 60 = 1440 seconds

Distance covered will be

18 * 1440 = 25920 meters = 25.9 Kilo meters.

Again, if the bird takes less than 0.4 hours to cover the lake, the lake will be less than 25.9 kilometers long. This means that it could be greater than or lesser than 21 kilometers. It cannot be definitive

7 0

4 years ago

At 96Â° F the saturation density of air is 0.04 kg/m3. If the weather report says the relative humidity is 90 % when the tempera

nalin [4]

Answer:

The value is $H = 0.036 \ kg/m^3$

Explanation:

From the question we are told that

The saturation density of air is $\rho = 0.04 \ kg/m^3$

The temperature for this saturation density to occur $T_s = 96^o F$

The relative humidity at this temperature is $R_h = 90\% = 0.90$

Generally the relative humidity is mathematically represented as

$R_H = \frac{H}{\rho}$

Here H represents humidity

=> $0.90 = \frac{H}{0.04}$

=> $H = 0.90 * 0.04$

=> $H = 0.036 \ kg/m^3$

8 0

3 years ago

HELP ASAP!!!!! ILL MARK YOU BRAINLIEST!

Julli [10]

Hello! Sorry this is a little late!

The answer to your question would best be option C, y<span>es, because electric charges have electric fields surrounding them that allow them to exert forces on other objects without touching them.

I just took this test, and can 100% confirm this is the correct answer!

Hope this helps, and have a great day! :)</span>

8 0

3 years ago

Read 2 more answers