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3 years ago

14

How long will it take for a rock to fall 12 meters?

1 answer:

Amiraneli [1.4K]3 years ago

6 0

Answer:

approximately 5.8 seconds

Explanation:

if you where to time how fast a rock would fall 12 meters it would approximately be 5.8 seconds

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An uncharged capacitor and a resistor are connected in series with a switch and a 12 V battery. At the instant the switch is clo

balu736 [363]

Answer:

V = 12 V

Explanation:

Since a capacitor can't change the voltage between its plates instantaneously, this means that just after the switch is closed, the voltage through the capacitor is zero.
So, the current that flows in this moment is the same that would flow in a series circuit with only one resistor connected to the battery.
Applying KVL to the circuit (neglecting the presence of the capacitor which can be replaced by a short circuit just after closing the switch), the voltage through the resistor must be equal to the one of the battery, i.e., 12 V.

5 0

3 years ago

A couple walking in the park strolls 1.5 km in 60 min. What is the couple’s average speed in m/h?

cricket20 [7]

Answer:

0.932 m/h

Explanation:

Parameters given:

Distance walked by couple, D = 1.5 km

Time spent in walking, t = 60 min

To solve this we simply apply the formula for average peed:

Average Speed = total distance / total time taken

The question asks specifically to put the answer in miles per hour (m/h), hence, we need to convert the distance to miles and the time to hours:

Distance in miles:

1 km = 0.622 miles

1.5 km = 1.5 * 0.622 = 0.932 miles

Time in hours = 60 / 60 = 1 hour

Hence, the speed is:

Speed = 0.932 / 1 = 0.932 m/h

The average speed of the couple is 0.932 m/h

6 0

3 years ago

Read 2 more answers

If we decrease the distance an object moves we will

Scrat [10]

Decrease the amount of work done.

4 0

3 years ago

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3 kg of wet clothes are hung on the middle of a clothesline with posts 6 ft apart. The clothesline sags down by 3 feet. What is

miskamm [114]

Answer:

Tension in string equals 14.715 Newtons

Explanation:

The situation is represented in the figure attached below:

For equilibrium of the clothes along y- axis we have

$\sum F_{v}=0\\\\\Rightarrow 2Tcos(\theta )=W\\\\\therefore T=\frac{W}{2cos(\theta )}$

Applying values we get

$\sum F_{v}=0\\\\\Rightarrow 2Tcos(\theta )=W\\\\\therefore T=\frac{3\times 9.81}{2\times 1}=14.715N(\because cos(\theta )=\frac{3}{3}=1)$

4 0

3 years ago

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An astronaut is standing on the surface of a planetary satellite that has a radius of 1.74 × 10^6 m and a mass of 7.35 × 10^22 k

ExtremeBDS [4]

Answer:

2.87 km/s

Explanation:

radius of planet, R = 1.74 x 10^6 m

Mass of planet, M = 7.35 x 10^22 kg

height, h = 2.55 x 10^6 m

G = 6.67 x 106-11 Nm^2/kg^2

Use teh formula for acceleration due to gravity

$g=\frac{GM}{R^{2}}$

$g=\frac{6.67\times 10^{-11}\times 7.35\times 10^{22}}{1.74^{2}\times 10^{12}}$

g = 1.62 m/s^2

initial velocity, u = ?, h = 2.55 x 10^6 m , final velocity, v = 0

Use third equation of motion

$v^{2}=u^{2}-2gh$

0 = v² - 2 x 1.62 x 2.55 x 10^6

v² = 8262000

v = 2874.37 m/s

v = 2.87 km/s

Thus, the initial speed should be 2.87 km/s.

6 0

3 years ago