A person opens a door by applying a 10-N force perpendicular to it at a distance 0.90m from the hinges.

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Answer 1

Answer: You faded out there before asking your question.
Here's some info that might be of interest:

Torque = (force) x (distance from the pivot) = (10 n) x (0.9 m) = 9 newton-meters

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A dolphin leaps out of the water at an angle of 36.6° above the horizontal. The horizontal component of the dolphin's velocity is 7.87 m/s. Calculate the magnitude of the vertical component of the velocity.
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A piston exerts a force of 2,500 newtons on liquid in a cylindrical container. If the pressure on the top of the liquid is 12.5 kilopascals, find the area of the surface of the liquid, in square meters. ? please help

Answers

Here are the choices.

A. 200 m
B. 31.25 m
C. 0.2 m
D. 5 m

Pa = N/m²
m² = N/Pa

12.5 kPa = 12500 Pa

m² = N/Pa
m² = 2500 / 12500
m² = 0.2

C. 0.2 m²

So the correct answer is 0.2m^2

A heavy brick weighs more than a fluffy cushion, but the cushion takes up more space. Which object has more matter? How do you know?

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The heavy brick has more matter. The amount of matter in an object is determined by its mass, which is a measure of the total amount of material in the object.

Which object has more matter?

In this situation, the brick is heavier, which means it is bigger and has more stuff inside compared to the soft cushion.

Weight is the push or pull on something because of gravity, and it can change depending on how strong the gravitational field is. But, mass is a basic characteristic of stuff that stays the same no matter the pull of gravity. The brick is heavier, so it has more stuff inside than the cushion.

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The statement that best describes an external circuit is "D. The flow of an alternating current switches direction when a generator's terminals change its charge." The main difference between direct and alternating current is the direction of flow. Direct current follows only one direction from negatve to positive, while alternating current changes direction periodically.

Answer: D. The flow of an alternating current switches direction when a generator's terminals change its charge.

Explanation: I JUST TOOK THE PF EXAM AND GOT IT CORRECT!!!

The notation specific to the organization or arrangement of electrons within orbitals surrounding the nucleus of an atom.

Answers

Electron configuration

Heat of Fusion How much thermal energy is needed change 50.0 g of ice at -20.0°C to water at 10.0°C?

Answers

We should divide the problem into 3 separate processes.

1) Bring the temperature of the ice from $-20.0^(\circ)C$ to its melting point ( $0^(\circ)C$ ): the amount of heat needed in this process is
$Q_1=mC_s \Delta T$
where
$m=50.0 g$ is the mass of the ice
$C_s = 2.108 J/g^(\circ)C$ is the specific heat capacity of ice
$\Delta T=0^(\circ)C-(-20^(\circ)C)=20^(\circ)C$ is the increase of temperature

Plugging numbers into the equation, we find
$Q_1 = (50.0 g)(2.108 J/g^(\circ)C)(20^(\circ)C)=2108 J$

2) Fusion of ice
When the ice is at melting point, we need to add a certain amount of heat in order to melt it, and this amount of it is given by:
$Q_2 = mL_f$
where
$m=50.0 g$ is the mass of ice
$L_f = 334 J/g$ is the latent heat of fusion of ice

Plugging numbers into the equation, we find
$Q_2 = mL_f = (50.0g)(334 J/g)=16700 J$
During this phase transition, the temperature of the ice/water does not change.

3) Bring the temperature of the water from $0^(\circ)C$ to $10^(\circ)C$

The amount of heat needed for this process is
$Q_3 = mC_s \Delta T$
where
$m=50.0 g$ is the mass of water
$C_s = 4.187 J/g^(\circ)C$ is the specific heat capacity of water
$\Delta T=10^(\circ)C-0^(\circ)C=10^(\circ)C$ is the increase of temperature

Plugging numbers into the equation, we find
$Q_3 = (50.0 g)(4.187 J/g^(\circ)C)(10.0^(\circ)C)=2094 J$

--> therefore, the total energy needed for the whole process is:
$Q=Q_1+Q_2+Q_3=2108 J+16700 J+2094 J=20902 J=20.9 kJ$

Scientists might make a computer model of volcanic eruptions. What is the biggest benefit of this model

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Answer:

I think it would be to be able to prevent a volcanic eruption in the future and take the appropriate prevention protocols.

Explanation:

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Any fracture or system of fractures along which Earth moves is known as a A. strain.B. deformation.C. stress.D. fault.

Brownian motion cannot be detected in colloids. True or false?

A 3.8 kg object is lifted 12 meters. Approximately how much work is performed during the lifting? A. 588 J B. 45.6 J C. 446.9 J D. 372.4 J