When an astronaut in orbit experiences apparent weightlessness,
a. no forces act on the astronaut.
b. no gravitational forces act on the astronaut.
c. the net gravitational force on the astronaut is zero.
d. the net gravitational force on the astronaut is not balanced by a normal force.?

Answer: Option A

Explanation: The buoyant force depends on the amount of displaced fluid (in this case water)

As the wood is less dense than the iron, the wood requires a lot less upwards force to float, and it only displaces a little bit of fluid, in the other case, the iron requires a lot more of force to do it, so it displaces a lot of water and is totally submerged, and the iron block can never float actually, so it sinks down, at the point that the buoyant force applied is negative (the weight of the water upside the block is bigger than the force upwards)

The Buoyant force can be calculated as:

B = weight on-air - weight on water.

The block of wood is floating, so the weight on the water is zero, and the buoyant force is equal to his weight in the air.

For the block of  iron, we have:

B = Weight on-air - weight on water, here in both cases we have positive numbers, but not enough information to know them.

Then the only information that we have is that the woodblock displaces less water than the other block, so with this, we only can know that the buoyant force in the woodblock is smaller.

Egenuity says the answer is False ^-^

Answer: The given statement is false.

Explanation:

In the United states, both men and women are treated equally and like men, women also work for living.

Also women has the responsibility to do house hold chores so most of the time women are busy with their family or work. Hence, they do not get enough leisure time.

Therefore, the statement women in the United States have 10 hours more leisure time per week than men, is false.

Answer: Yes

Explanation: The definition of displacement is the change on the position, So if i start in my home, then i go to the mall, and after that i return home, the total displacement over that period of time is 0, because i started in my house and ended in my house. But in that proces i traveled the distance between my house and the mall two times. So is possible to travel great distances without any displacement, only if the endpoint of the travel is the same as the start point.

Answer:

Absolute Zero

Explanation:

The lowest limit of thermodynamic temperature is called as absolute zero. By international agreement, on kelvin scale it is 0 K and on Celsius scale it is equal to -273.15° C. This is considered as the lowest possible temperature. At this temperature the particle vibration is minimum and no heat energy remain in the substance.

The greater the force exerted by the engine of a car over a set distance, the greater the change in  momentum.

The definition of force in physics is: The push or pull on a massed object changes its velocity.

An external force is an agent that has the power to alter the resting or moving condition of a body. It has a direction and a magnitude. A spring balance can be used to calculate the Force. Newton is the SI unit of force.

According to Newton's second law of motion:

Force = rate of change in momentum per unit time.

Hence, The magnitude of the change in momentum increases with the amount of force applied by a car's engine over a given distance.

Learn more about force here:

https://brainly.com/question/13191643

#SPJ2

Answer:

Explanation: B. A change in particle position

Answer: Option (B) is the correct answer.

Explanation:

Melting point is defined as the point at which a solid substance changes into liquid state.

During the melting point temperature of substance remains constant until the whole solid substance changes into liquid state.

At the melting point, particles of the solid vibrate rapidly and as a result position of the particles changes from one place to another.

Thus, we can conclude that as a solid reaches its melting point intermolecular bonds have been disrupted, causing a change in particle position.

Less heat would be removed from the refrigerator.

Explanation:

A free body diagram shows all the forces acting on the object- all the magnitudes and the directions. The forces acting at an angle on an object are written in the form of their components in the horizontal and vertical direction.  The forces in the single direction are added up. Thus, a free body diagram shows the net force acting on an object.

The velocity of an object dropped from a height of 300m at the moment it hits the ground is approximately 77.46 m/s.

The subject of the question is on kinematics under gravity, also referred to as free-fall motion. Here, you are asked to find the velocity of an object just before it hits the ground, having dropped from a height of 300m.

We can use the equation of motion for this operation: v² = u² + 2gH, where v is the final velocity, u is the initial velocity, g is the acceleration due to gravity (approx 9.8 m/s²) and H is height. In this case, the object is dropped, meaning its initial velocity (u) is zero. Substituting the values, we have v² = 0 + 2*9.8*300. Solving this, we get v = sqrt(2*9.8*300) = 77.46 m/s (approx). This is the velocity of the object at the moment it hits the ground when it is dropped from a height of 300 m.

https://brainly.com/question/28806509

#SPJ2

The answer is 15.0 mL

Answer : The correct option is, distance times force

Explanation :

Work : It is defined as the force acting on an object to cause a displacement. Or we can defined as the work is equal to the product of the force of an object and displacement of an object.

The formula of the work is written as,

[tex]W=F\times d[/tex]

where,

W = work done

F = force applied on an object

d = displacement of an object

Hence, the work is equal to distance times force.

Work is equal to distance times force in Physics. The force must be directly causing motion of the object for work to be calculated. For instance, pushing a box 5 meters with a force of 10 Newtons would result in 50 Joules of work.

In the field of Physics, work is defined as the force applied on an object times the distance that the object moves. In other words, work is equal to the product of distance times force. The force must be causing the object to move in the direction of the force in order for work to happen. For example, if you push a box 5 meters with a force of 10 Newtons, the work done would be 50 Joules (10 Newtons x 5 meters).

https://brainly.com/question/37571376

#SPJ6

Static electricity occurs when electrons are transferred between atoms, often triggered by friction (triboelectric effect). This effect can be observed in real-life examples such as rubbing a balloon against hair or the operation of a Van de Graaff generator. Materials' conductivity affects the ease of electron transfer and therefore, static electricity production.

Static electricity occurs because electrons, which carry negative charge, are relatively easy to scrape off or transfer between atoms. In everyday scenarios, static electricity is often produced by friction - a process scientifically referred to as 'triboelectric effect'. For instance, when you rub a balloon on your hair, the friction between the balloon and the hair can strip electrons off from your hair atoms. Consequently, the balloon becomes negatively charged and your hair positively charged, enabling them to attract each other due to the interaction of their opposite charges.

The behavior of static electricity can also be illustrated by the principle working behind the Van de Graaff generator. Inside it, electrons are transferred from one part to another through physical contact and motion, creating a build-up of static charge. This further causes the charges to repel each other and spread to the outer surface of the machine.

It's important to note that not every material conducts static electricity equally well. Conductors, such as metals, have free electrons that allow easy flow of electricity. Insulating materials, on the contrary, resist the flow of electricity due to the absence of free electrons.

https://brainly.com/question/24160155

#SPJ12

Answer:

0.4km/s

Explanation:

To be able to know the greatest speed out of all the speed values, we will have to convert the velocities value to m/s.

Converting velocity of 400cm/s to m/s, we have;

400cm/s × 1m/100cm

= 4m/s

Since 100cm = 1m

For velocity of 0.4km/s, we have;

0.4km/s × 1000m/1km

= 400m/s

Note that 1000m = 1km

For velocity 40,000mm/s, we have;

40,000mm/s× 1m/1000mm

= 40m/s

Since 1000mm = 1m

Therefore among all the converted values, the velocity of 0.4km/s which is equivalent to 400m/s is the greatest.

Answer:

Gamma rays and its uses are discussed below.

Explanation:

Characteristics of Gamma rays

Uses of Gamma rays

The correct answer to the question is : 2.976 miles/hour.

CALCULATION:

As per the question, the distance travelled by the bird X = 1000 miles.

 The time taken by the bird to cover that distance t = 2 weeks.

                                                                                     = 2 × 7× 24 hours

                                                                                     = 336 hours

We are asked to calculate the speed of the bird.

The speed of the bird is calculated as -

                         speed v = [tex]\frac{distance}{time}[/tex]

                                        = [tex]\frac{1000}{336}\ miles/hour[/tex]

                                        = 2.976 miles/hour                   [ans]

Hence, the velocity of the bird is 2.976 miles/hour.

The movement of electrons due to a difference in electric potential energy is the electric charge.

Learn more about electric charge:

https://brainly.com/question/22079477