Physics Help Please!!! All multiple choice!

1.) Does an object moving in uniform circular motion have constant centripetal acceleration?
True or False

2.) How do the angular velocities of three knots on a rope compare as it is swung around in a circle? How about their speeds?

a.) the angular velocity and linear velocities are the same

b.) the linear velocities are the same, the angular velocity increases as you move toward the outside dot

c.) the angular velocity is the same, the linear velocities are fastest in the center

d.) the angular velocity is the same, the linear velocities are fastest on the outside

e.) both the linear and angular velocities increase as you move out



3.) An object travels with a constant speed in a circular path. The net force on the object is

a.) zero

b.) toward the center

c.) away from the center

d.) tangent to the object's path

Among these 4 forces, the only force acting on the plane at a distance is weight.

In fact, weight is due to gravity, which is a non-contact force (it acts also from a distance). All the other forces, instead, are due to the contact between the plane (or parts of it) with the surrounding air: without the air, all the other 3 forces (thrust, lift, drag) would not be present, while weight would be always present.

The answer choice is B

Answer:

B. 29 years

Explanation:

The Answer is:

Agriculture and Fishing

it is by multiplying the output force by the output distance

Answer:

78 miles

Explanation:

The average velocity of the bus is given by:

[tex]v=\frac{d}{t}[/tex]

where

d is the displacement (the distance between the two cities)

t is the time taken

In this problem, we have

t = 1.5 h

v = 52 mph

So, we can solve the formula to find d, the distance between the cities:

[tex]d=vt=(52 mph)(1.5 h)=78 mi[/tex]

The rock sample's half-life span remains constant. It will always be 4.5×10⁹ years no matter how many times it is cutting process.

Uranium, with the atomic number 92 and the symbol U in the periodic table, is a weakly radioactive element. One of the heavy metals that may be used as a concentrated energy source is uranium.

The element is found in various rocks in concentrations of 2 to 4 ppm (parts per million).

The rock sample's half-life span remains constant. It will always be 4.5×10⁹ years no matter how many times it is cutting process.

Hence the half-life of the uranium remains unchanged.

To learn more about uranium refer to the link;

brainly.com/question/9099776

#SPJ3

3 different elements make up beryllium sulfite.

The final velocity of the first ball is 3 m/s and the final velocity of the second ball is 2 m/s in opposite direction.

The given parameters;

Apply the principle of conservation linear momentum;

[tex]m_1u_1 \ + \ m_2u_2 = m_1v_1 + m_2v_2\\\\2m - 3m = mv_1 + mv_2\\\\-m = m(v_1 + v_2)\\\\-1 = v_1 + v_2[/tex]

Apply one-dimensional velocity;

[tex]u_1 +v_1 = u_2 + v_2\\\\2 + v_1 = -3 + v_2\\\\5 + v_1 = v_2[/tex]

From the first equation, the values of the final velocity is calculated as follows;

[tex]-1 = v_1 + 5 + v_1\\\\-1 = 2v_1 + 5\\\\-6 = 2v_1\\\\v_1 = -3 \ m/s[/tex]

then, v₂ = 5 - 3 = 2 m/s

Thus, the final velocity of the first ball is 3 m/s and the final velocity of the second ball is 2 m/s in opposite direction.

Learn more here:https://brainly.com/question/15869303

The type of mass movement that happens very slowly is Creep.

Explanation:

Mass movement, usually known as mass wasting, is that the descent movement of a mass of surface materials, like soil, rock or mud. This mass movement generally happens on hillsides and mountains because of the influence of gravity and may happen terribly slowly or terribly quickly.

The change in velocity is the difference of the final velocity and the initial velocity:

0 – 6 = -6 m/s.

The work function of a metal is the minimum energy required to remove an electron from the metal surface. The energy can be calculated with the given light wavelength, but additional data is needed to find the specific work function of aluminium.

The work function of a metal is the minimum amount of energy required to remove an electron from the surface of the metal. This is a concept from the field of physics known as the photoelectric effect, commonly associated with Albert Einstein.

The energy of incident photons can be calculated using the formula E = hc/λ, where E is the energy, h is the Planck's constant, c is the speed of light, and λ is the wavelength of the light. The maximum kinetic energy of the ejected electrons, on the other hand, is given by the equation KE = E - W, where E is the energy of the incident photon and W is the work function of the metal.

Consequently, to find the work function or binding energy of a particular material, you can rearrange the equation into W = E - KE. For this specific problem though, more information would be necessary such as the kinetic energy of the ejected electrons to pinpoint the work function of aluminium metal in kj/mol specifically.

https://brainly.com/question/12658742

#SPJ3

Final answer:

Compression waves and water waves share similarities as longitudinal waves that transfer energy through a medium, but they differ in their propagation medium and oscillation nature.

Explanation:

Compression waves and water waves are both types of longitudinal waves that involve oscillations. They share the common characteristic of transmitting energy through a medium. However, they differ in the medium through which they travel and the nature of their oscillations.

Answer: 4

The mechanical advantage is the ratio of the force exerted  by the object to the force applied to do work on it.

Here, Jeff tried to lift a rock weighing 600 pounds by wedging board under the rock. Jeff who weighs 150 pounds uses all his weight to exert force on lever and lift rock.

Mechanical advantage, [tex]M.A.=\frac{weight\hspace{1mm}of\hspace{1 mm}rock}{weight\hspace{1mm}of\hspace{1 mm}Jeff}=\frac{600 pounds}{150 pounds}=4.[/tex]

Therefore, the mechanical advantage that lever provided to Jeff in lifting rock is 4.

Final answer:

The mantle makes up 70% of the Earth's total volume, which is the largest layer of the interior structure of the Earth. It accounts for 82.5% of the Earth's volume, with the core and crust making up the rest.

Explanation:

The component that makes up 70% of the Earth's total volume is the mantle. The mantle is predominantly composed of silicate rock and is situated between the Earth's crust and core. It comprises approximately 82.5% of the Earth's volume, making it the largest layer of the Earth's interior. The core is the second-largest layer, accounting for 16.1% of the volume, while the crust is the thinnest layer, making up only 1.4%. It is important to note that although water covers approximately 71% of the Earth's surface, it is not what comprises the largest volume of Earth's internal structure, as might be mistakenly inferred.

Answer:

393.399 J/kg.°C

Explanation:

Specific heat capacity: This is the quantity of heat required to raise the temperature of a unit mass of a substance through a degree rise in temperature.

Heat lost by the brass = heat gained by water

CM(t₁-t₃) = cm(t₃-t₂)........................ Equation 1

Where C = specific heat capacity of the brass, M = mass of the brass, t₁ = initial temperature of the brass, t₂ = initial temperature of water, t₃ = temperature of the mixture.

Making C the subject of the equation

C = cm(t₃-t₂)/M(t₁-t₃)............................... Equation 2

Given: M = 0.59 kg, m = 2.8 kg, t₁ = 98 °C, t₂ = 5.0 °C, t₃ = 6.8 °C

Constant: c = 4200 J/kg.°C

Substitute into equation 2,

C = 2.8×4200(6.8-5.0)/0.59(98-6.8)

C = 21168/53.808

C = 393.399 J/kg.°C

Thus the specific heat capacity of the brass = 393.399 J/kg.°C

To calculate the specific heat capacity of a metal, use the heat transfer formula considering that the heat lost by the metal is equal to the heat gained by the water when they reach thermal equilibrium. By rearranging the formula, you can solve for the metal's specific heat capacity using the given mass and temperature change for both the metal and the water.

To determine the specific heat capacity of an unknown metal, you can use the heat transfer formula:

q

= m c ΔT

where q is the heat transferred, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

Since the metal and water reach thermal equilibrium, we know that the heat lost by the metal is equal to the heat gained by the water:

Heat lost by metal = Heat gained by water

mmetal cmetal (Tinitial,metal - Tfinal) = mwater cwater (Tfinal - Tinitial,water)

You can rearrange the formula to solve for the specific heat capacity of the metal:

cmetal = ⁰(mwater cwater (Tfinal - Tinitial,water)) ⁰(mmetal (Tinitial,metal - Tfinal))

Now, plugging in the values, you can calculate the specific heat capacity of the metal.

Final answer:

The experiment likely demonstrates heat transfer by conduction as heat is transferred through physical contact. Convection and radiation are other forms of heat transfer explained in the context of the experiment.

Explanation:

Kim's experiment most likely demonstrates **heat transfer by conduction.** Conduction is the transfer of heat through stationary matter by physical contact. In this experiment, the heat from the hot water is transferred to the iron rod, causing the wax on one end to melt due to the direct contact.

Convection involves the heat transfer by the macroscopic movement of a fluid, like in a forced-air furnace or weather systems. Radiation occurs when electromagnetic radiation is emitted or absorbed, like the warming of Earth by the Sun or thermal radiation from the human body.

The brother on the outer edge of the merry-go-round experiences greater centripetal acceleration due to the larger radius of his circular path.

The brother riding on the outer edge of the merry-go-round will experience greater centripetal acceleration than his sister who is positioned closer to the center. This is because centripetal acceleration depends on both the angular velocity and the radius of the path of the moving object. Since both are riding on the same merry-go-round and thus have the same angular velocity, the one farther from the center (the brother) has a larger radius, and therefore a greater centripetal acceleration.

The answer to this question is B. Nonmetal