A car with a mass of 525kg is being pushed west (left) by a force of 375n from its engine. the coefficient of friction felt by the car is .0420.
a.calculate the force weight of the car.
b.calculate the force friction acting on the car.
c.what is the net force acting on this car?
d.calculate the acceleration of the car.

Answer: From land towards sea

Explanation:

Land breeze occurs at night in coastal regions. At night, the land cools down faster a compared to water in the sea. Thus, the air above the sea is less dense and thus, has low air pressure as compared to air over land. Thus, the wind would blow from land towards sea during night. This is known as land breeze.

The angular speed of a wheel that rotates clockwise 10 times per second is 20π rad/s. The direction of this rotational movement is determined by the right-hand rule used in physics and engineering. It is important to note that if the angular velocity is not constant, then the system has an angular acceleration.

The question is asking about the angular speed of a wheel that rotates clockwise 10 times per second. In physics, angular speed is defined as the measure of how quickly an object moves through an angle. It is calculated by dividing the number of rotations or revolutions by the time period. In this case, the wheel rotates 10 times per second, which is the same as making 10 complete revolutions each second. We know that one complete revolution (360 degrees) is equivalent to 2π radians, so the angular speed in radians per second would be 10 * 2π, which is equal to 20π rad/s.

The concept of angular speed is often used in physics and engineering to describe the motion of objects rotating around an axis. The direction of angular velocity is determined by the right-hand rule. The right-hand rule is such that if the fingers of your right hand wrap counterclockwise from the x-axis (the direction in which increases) toward the y-axis, your thumb points in the direction of the positive z-axis (Figure 10.5). An angular velocity that points along the positive z-axis therefore corresponds to a counterclockwise rotation, whereas an angular velocity that points along the negative z-axis corresponds to a clockwise rotation. If the system's angular velocity is not constant, then the system has an angular acceleration.

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The work done by tension is zero. The work done by friction is negative. The net work done is positive.

1) The work done by tension before the block gets to the incline is zero because the tension force is acting perpendicular to the displacement.

2) The work done by friction as the block slides on the flat horizontal surface is negative because the friction force is acting opposite to the displacement.

3) The speed of the block right before it begins to travel up the incline can be calculated using the work-energy theorem, which states that the work done on an object is equal to the change in its kinetic energy.

4) The distance up the incline that the block travels before coming to rest can be calculated using the work-energy theorem and the work done by friction.

5) The work done by gravity as the block comes to rest is zero since there is no displacement in the vertical direction.

6) The net work done on the block during the entire process is positive.

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The solid sphere will go the farthest up the incline because it has the smallest moment of inertia, allowing for a larger proportion of kinetic energy to be used in translational motion compared to a solid disk and a hoop with the same mass and radius.

The situation involves a solid ball, a solid disk, and a hoop rolling up an incline which raises a fascinating question about rotational motion and energy conservation in physics. They all have the same mass, radius, and initial translational speed, so the one that will go farthest up the incline is the one with the smallest rotational inertia relative to its mass. When an object rolls without slipping, kinetic energy is divided between translational motion (linear movement) and rotational motion (spinning).

The moment of inertia (I) characterizes an object's resistance to changes in its rotational motion. The moment of inertia is different for each object:

For a hoop, I = MR²

For a solid disk, I = (1/2)MR²

For a solid sphere, I = (2/5)MR2²

Since all objects have the same mass (M) and radius (R), the one with the smallest 'I' will have the most translational kinetic energy, and therefore, it will go the farthest up the incline before stopping. The solid sphere has the smallest moment of inertia, meaning it has a higher proportion of its kinetic energy in translational form than the disk and the hoop. As such, the solid sphere will reach the highest point on the incline before coming to a stop.

Answer:

D) The cell will not store food water nutrients and waste

Photosynthesis in plants takes place to synthesis food and energy. In the absence of this process, plants cannot store food and nutrients .

Photosynthesis is a biochemical process takes place in plants to synthesis chemical energy in the form of glucose by the aid of light energy. The green pigment in leaves called chlorophyll helps to absorb sufficient light energy for this process.

In a photosynthetic reaction, water and carbon dioxide combines to form oxygen gas and glucose. This glucose is the source of energy in plants. The oxygen gas released by photosynthesis is used by animals for respiration.

If photosynthesis does not  taking place, plants fails to synthesis their food which further affect the cellular respiration as well. Therefore, option d is correct.

Find more on photosynthesis:

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Answer:

1. 3) urges them to remember their duty and 2. 1) a model of loyalty are the correct answers.

Explanation:

In the first question, Wiglaf tries to convince his mates not to give up and to help his lord and also remembering what their intention was. Beowulf is supposed to receive help because he is old and he cannot deal with the monster by himself anymore, so Wiglaf is there because of that.

In the second one, it is seen that Wiglaf is the only one who doesn't give up on Beowulf, even when Beowulf is about to die after the fight with the dragon and Wiglaf kills it as a maximum expression of his loyalty.

Final answer:

To determine the radius of the satellite's circular orbit, use Kepler's third law.

Explanation:

To determine the radius of the satellite's circular orbit, we can use Kepler's third law, which states that the period of an orbit is related to the radius of the orbit. The formula for Kepler's third law is:

T² = (4π²*r³) / (G*M)

Where T is the period, r is the radius, G is the gravitational constant, and M is the mass of the Earth. We are given the period of the satellite (6560 s) and the mass of the satellite (5420 kg), so we can solve for the radius using the formula.

T² = (4π²*r³) / (G*M)

6560² = (4π²*r³) / (6.67 x 10⁻¹¹ * 5.97 x 10²⁴)

Using this equation, we can solve for r, the radius of the satellite's circular orbit.

The most accurate description of a risk with using radioisotopes in nuclear reactors is the potential for radiation to leak and cause significant harm to living organisms which is described in option D. This includes the possibility of serious malfunctions in cell processes and the challenge of managing high-level radioactive waste.

The statement that best describes a risk associated with using radioisotopes in nuclear reactors is D: If the radiation were to leak out of the reactors, it could cause significant damage to living organisms. Radioactive emissions from radioisotopes can fragment or ionize molecules, which leads to the production of highly reactive ions and molecular fragments. This damage to biomolecules can cause disruptions in cell processes, leading to illness or death. Accidents or leaks from nuclear reactors can also result in the exposure of these radioisotopes to the environment, affecting humans, animals, and the ecosystem.

Moreover, the disposal of high-level radioactive waste generated from spent nuclear fuel is a significant concern. It presents long-term risks due to the potential leakage of radiation into the environment and the complex and costly processes required for safe disposal. Hence, although nuclear energy is a potent source without greenhouse gas emissions, the risks involving radiation leaks and waste management are genuine concerns.

The strength of an electric field (E) can be determined using the formula:

[tex]\[ E = \frac{F}{q} \][/tex]

where:

- [tex]\( E \)[/tex] is the electric field strength,

- [tex]\( F \)[/tex] is the force experienced by the charge,

- [tex]\( q \)[/tex] is the magnitude of the charge.

In this case, the given values are:

- [tex]\( F = 4.5 \times 10^{-4} \, \text{N} \) (force)[/tex],

- [tex]\( q = 6.0 \times 10^{-4} \, \text{C} \) (charge)[/tex].

Now, plug these values into the formula:

[tex]\[ E = \frac{4.5 \times 10^{-4} \, \text{N}}{6.0 \times 10^{-4} \, \text{C}} \][/tex]

[tex]\[ E = \frac{4.5}{6.0} \, \text{N/C} \][/tex]

[tex]\[ E = 0.75 \, \text{N/C} \][/tex]

Therefore, the strength of the electric field is [tex]\(0.75 \, \text{N/C}\)[/tex].

The force experienced by a positively charged particle moving westward and just north of a wire with a current directed east will be downward, based on the right-hand rule of electromagnetism.

The scenario described involves a current-carrying wire and the motion of a charged particle, both of which invoke the concept of the magnetic force as per the right-hand rule in electromagnetism. According to this rule, if we point the thumb of our right hand in the direction of the current (which in this case is east), and our fingers in the direction of the velocity of the positive charge (which is west), then the palm faces toward the direction of the force on a positive charge. Since the charge is moving just north of the wire, the magnetic field will be directed towards the earth's surface (downwards if we consider the conventional 3D coordinate system). Therefore, the resulting force experienced by the positively charged particle will be downward, towards the ground.

Final answer:

Thermal conduction in solids occurs as atoms and molecules rapidly move or vibrate, transferring kinetic energy to neighboring particles, and through movement of electrons, facilitating heat transfer without the mass flow characteristic of convection.

Explanation:

On a particle level, when thermal conduction occurs within a solid, rapidly moving or vibrating atoms and molecules transfer some of their kinetic energy to adjacent particles. This is the principal means for heat transfer within a solid, with the close fixed spatial relationships between atoms in a solid facilitating this transfer by vibration. Heat is also transferred by the movement of electrons from one atom to another. Unlike convection which occurs in fluids, heat transfer by conduction in solids does not involve large-scale flow of matter.

For example, the heat from an electric burner transfers to the bottom of a pan via conduction. The hot surface causes the atoms in the pan to vibrate more energetically, which then collide with neighboring atoms, spreading the heat throughout the pan. Conductive heat transfer efficiency is affected by the temperature difference, size and thickness of the material, as well as its thermal properties.