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1 year ago

A book rests on a wooden table is an example of

Physics

1 answer:

kykrilka [37]1 year ago

7 0

Answer:

Static friction

Explanation:

When there is contact between two surfaces and there is no movement, there is static friction. So, if we have a book that rests on a wooden table, we have an example of Static friction, where this force avoids the movement of the book.

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A basesball is dropped from 100 meters above the surface of the earth. The baseball falls to the ground. What would happen if th

Serjik [45]

Given that, A basesball is dropped from 100 meters above the surface of the earth. If the same baseball was dropped from 100 meters above the surface of the moon, it will take more time to hit the ground as compare to the ball dropped on earth. This is moon's gravity is one-sixth of that of earth. Object falling on earth possess more force of attraction. So it will reach the earth in lesser time. At moon the force of attraction is low compare to that of earth. Object will take more time to reach the surface.

4 0

3 years ago

Read 2 more answers

A 1500 W hair dryer operates on a household outlet of 120 V. What is its resistance?

Jlenok [28]

Answer:

I literally just got done doing something like this in my physic class. The resistance is 9.6 ohms.

5 0

3 years ago

A skateboarder jumps horizontally off the top of a staircase and lands at bottom of the stairs. The staircase has a horizontal l

e-lub [12.9K]

Answer:

The vertical velocity of the skater upon landing is 10.788 meters per second.

Explanation:

Skateboarder experiments a parabolic movement. As skateboarder jumps horizontally off the top of the staircase, it means that vertical component of initial velocity is zero and accelerates by gravity, the final vertical speed is calculated by the following expression:

$v = v_{o} + g\cdot t$

Where:

$v_{o}$ - Initial vertical speed, measured in meters per second.

$v$ - Final vertical speed, measured in meters per second.

$g$ - Gravitational acceleration, measured in meters per square second.

$t$ - Time, measured in seconds.

Given that $v_{o} = 0\,\frac{m}{s}$ , $g = -9.807\,\frac{m}{s^{2}}$ and $t = 1.10\,s$ , the final velocity of the skater upon landing is:

$v = 0\,\frac{m}{s} + \left(-9.807\,\frac{m}{s^{2}} \right)\cdot (1.10\,s)$

$v = -10.788\,\frac{m}{s}$

The vertical velocity of the skater upon landing is 10.788 meters per second.

3 0

3 years ago

The energy goes from _____ to the _____ above it.

Artist 52 [7]

Answer:

The energy goes from the ground state to the excited states above it.

4 0

2 years ago

A 4 kg book and a 7 kg lamp are both in the living room. If the force of gravity between them is 2.99x10^-10 N. How far apart ar

Xelga [282]

Force of gravity = 'G' (mass₁)(mass₂) / (distance)²

'G' is the gravitational constant for SI units = 6.67 x10⁻¹¹ newton-meter²/kg²

You said that the force is 2.99 x 10⁻¹⁰ = (6.67x10⁻¹¹) (4) (7) / D²

Multiply each side by D² : 2.99 x 10⁻¹⁰ D² = (6.67x10⁻¹¹) (28)

Divide each side by 2.99 x 10⁻¹⁰ : D² = (28) (6.67 x10⁻¹¹) / (2.99 x 10⁻¹⁰)

Take the square root of each side: D = square root of all that

Stuff it through my calculator:

 D = square root of [ (28) (6.67 x10⁻¹¹) / (2.99 x 10⁻¹⁰) ] =

 √ ( 6.2462...) meters² =

2.5 meters  (rounded)

===================

To get the feel:

-- The book weighs about 8.8 pounds (big book)
-- The lamp weighs about 15.4 pounds
-- They're about 8.2 feet apart.
-- The strength of the gravitational force
 between them is about 0.000 000 001 075 of an ounce .

5 0

2 years ago