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3 years ago

A 1-kg rock is suspended by a massless string from one end of a

Physics

1 answer:

maxonik [38]3 years ago

6 0

Answer:

The weight of measuring stick is 9.8 N

Explanation:

given information:

the mass of the rock, $m_{r}$ = 1 kg

measuring stick, x =1 m

d = 0.25 m

to find the weight of measuring stick, we can use the following equation:

τ = Fd

τ = 0

$F_{r} d$ - $F_{s}d$ = 0

F_{r} = the force of the rock

F_{s} = the force of measuring stick

$F_{s} =F_{r}$

= m g

= 1 kg x 9.8 m/s

= 9.8 N

thus, the weight of measuring stick is 9.8 N

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A hand moves a block vertically upward. Its speed slows down as it moves up (it is decelerating). The work done by gravity on th

Nataly_w [17]

Answer:

a. negative

b. zero

Explanation:

work is the change in the energy of a system due to external forces

work is done when a force moves a load through a distance in the direction of the force

The work done by a force on a system is positive when the force and the force displacement point in the same direction and negative when they point in opposite directions

in the scenario we are considering in the question, the force (the hand) moves the block vertically upwards but the displacement of the block reduces (in the opposite direction) since it decelerates. as such the work done by gravity on the block is negative.

the work done on the block is zero if the system consists of the block and the earth because there is no gravitational force exerted on the system

5 0

3 years ago

"A 3 kg crate slides down a ramp. The ramp is 1 m in length and inclined at an angle of 30 degrees. The crate starts from rest a

OlgaM077 [116]

Answer:

v = 2.57 m /sec

Explanation: See Annex Free Body Diagram

From free body diagram and Newton´s second law we have

There is not movements in the y axis direction

cos 30° = √3/2 sin 30° = 1/2

We have P = mg = 3 Kg * 9.8 m/sec²

P = 29.4 Kg*m/ sec² P = 29.4 [N]

Py = P * cos 30° Py = 29.4 [N] * √3/2 ⇒ Py = 25.43 [N]

Px = P * sin 30° Px = 29.4 [N] * 1/2 ⇒ Px = 14.7 [N]

∑ F = m* a ⇒ ∑ Fy = 0 ∑ Fx = m *a

∑ Fy = Fn - Py = 0 Py = P*cos30° Py = 25.43 [N]

Fn = 25.43 [N]

Fr = μk * Fn ⇒ Fr = 0.19 * 25.43 ⇒ Fr = 4.83 [N]

Now

∑ Fx = m *a mg sin30° - Fr = m*a ⇒ Px - Fr = m*a

14.7 [N] - 4.83 [N] = 3 [kg] * a ⇒ 9.87 /3 = a [m /sec²]

a = 3.29 [m/sec²]

From uniformly accelerated movement

distance = x₀ + V₀*t ± at²/2 but x₀ and V₀ = 0

Then

d = ( 1/2 )*a*t² ⇒ 1 [m] * 2 = 3.29 [m/sec²] * t²

t = 0.78 sec

And finally

v = a*t ⇒ v = 3.29 *(.78) ⇒ v = 2.57 m /sec

5 0

3 years ago

What would happen to the brightness of the bulb in the following circuit as I increase the resistance of the variable resistor?

Margarita [4]

As you crank the variable resistor to higher resistance, the total current in the loop decreases. The power dissipated by the light bulb ... the heat and brightness it produces ... depend directly on the current through it, so they decrease too. Your circuit is a perfect incandescent light dimmer circuit.

4 0

3 years ago

Complete the sentence to describe conduction, convection, and radiation. Conduction, convection, and radiation are ways by which

Nutka1998 [239]

Explanation :

Conduction : Conduction is the transfer of heat due to collision between the molecules in the substance.

It is the way of energy transferred in the solid.

Convection : When air is heated and then travels away from the source that means air caries the heat along.

it is called convection.

It is the way of energy transferred in the air and liquid.

Radiation : radiation generate from the emission of electromagnetic wave.

electromagnetic wave carry the energy away from the source which is emitting the radiation.

It is the way of energy transferred in the vacuum.

3 0

3 years ago

Read 2 more answers

10). Three - fourth of the volume of a block which is floating in water extends above the surface

ikadub [295]

Answer:

Explanation:

Fill the graduated cylinder partially with water to a level where you can submerge the object and drop the sinker weight into the water. If you don't have a graduated cylinder to fit your object, put a cylinder in a basin, fill it to the top with water and measure the overflow into the basin. Your answer will be less accurate because of the number of times the water has been moved. Note the amount of displacement in milliliters (ml) caused by the sinker and string.

Measure the mass of your object (say a cork) on a balance scale in grams (g). Be sure the object is dry when it is measured. Record its weight. Attach the sinker with the string to the object. If you use a staple or pin, be sure to include that when you measure the displacement of the sinker in step one.

5 0

3 years ago