Which of the following are true about centripetal force? Check all that apply. A. Without centripetal force, an object cannot accelerate. B. Friction can be a centripetal force, such as when it keeps a car on the road going around a curve. C. Gravity can be a centripetal force, such as when it pulls a satellite in its orbit. D. It's also called an outward force.

The answer is; A.

This occurs for a cell that has no ion channel receptors. These cells have surface receptors that change conformation on the binding by an extracellular ligand on the active site. This change in conformation results in an initiation of a chain cascade of biochemical reactions inside the cell.  An example is cells responding to insulin and glucagon hormone that bind on their surface receptors that invokes cell responses that regulate blood sugar levels in the blood.

Answer:

mass of product = 105 g

Explanation:

Using one of the law of chemical combination, the total mass of the product can be computed. The law of conservation of mass is used to solve this question .The law states that matter can neither be created nor destroyed. The law states that the mass of the reactant is equal to the mass of the product. The law enunciated the fact that the net change in mass of the reactant and product should be equal to zero.

Since the mass of the reactants is known the product mass can be computed using the law of conservation of mass.

Mass of the reactant = 45 g + 60 g

Mass of the reactant = 105 g

Since the mass of reactant is known, the mass of the product will be the same if you apply the law of conservation of mass.

Therefore,  

mass of product = 105 g

fairlr accurate one .........

Answer:

It is Law/C.

Explanation:

I did the test. ✔

Answer

D. She should increase the number of coils in the primary winding.

Explanation

A transformer is a device that is used to step down or step up a the voltage.

It has two coils, primary and secondary that are used to determine how much the voltage changes.

To decrease the voltage the ratio of number of coils in the primary to the number of coils in the secondary should be big.

To reduce the voltage, D. She should increase the number of coils in the primary winding.

She should increase the number of coils in the primary winding.

A transformer is an electrical apparatus that transfers electrical energy from one electrical circuit to another through mutual electromagnetic induction.

The main purpose of transformer is to increase or decrease (alternating current (AC)) voltage in circuits.

In its structure there are 2 coils:

For decreasing voltage, ration of number of turns in coil of primary to secondary coil should big.

So to further reduce the voltage, she should increase the number of coils in the primary winding.

the answers going to be radiation it transfers the energy to light

questioned answered by

(jacemorris04)

Hi!

Which of the following describes when heat is transferred as a form of light?

Radiation - "is the transfer of heat energy through space by electromagnetic radiation."

Answer - Radiation

2. a cruise ship docked in a port

In fact, inertia is the resistance of an object to any change in its velocity/change of its state of motion. The inertia of an object depends only on the mass of the object: the greater the mass, the larger the inertia. In this case, the object with largest mass among the choices is the cruise ship docked in the port, so this is the object with most inertia.

3. gram

Mass represents the quantity of matter inside an object, and it is measured in grams (g). Actually, the SI units of the mass is the kilogram (kg), a multiple of the gram: 1 kg = 1000 g.

4. [tex]m/s^2[/tex]

Acceleration is defined as the rate of change of velocity per unit time:

[tex]a=\frac{\Delta v}{\Delta t}[/tex]

The change in velocity, [tex]\Delta v[/tex], is measured in m/s, while the time [tex]\Delta t[/tex] is measured in seconds (s): therefore, the acceleration is measured in

[tex][a]=\frac{[m/s]}{[s]}=[\frac{m}{s^2}][/tex]

5. Newtons

The Newton (N) is the SI unit used for the force. The force is defined as the product between mass (m) and acceleration (a):

[tex]F=ma[/tex]

since the mass is measured in kg and the acceleration in m/s^2, 1 Newton corresponds to

[tex]1 N= 1 kg \frac{m}{s^2}[/tex]

6. 1030 N

Given m=1.04 kg (mass of the hockey puck) and [tex]a=987 m/s^2[/tex] (acceleration of the hockey puck), the force needed to accelerate the puck with this acceleration is given by Newton's second law:

[tex]F=ma=(1.04 kg)(987 m/s^2)=1026 N[/tex]

which corresponds (approximately) to option C) 1030 N.

7. 520 kg

Given [tex]a=9.71 m/s^2[/tex] (acceleration of the car) and F=5050 N (net force applied on the car), we can find the mass of the car by using again Newton's second law:

[tex]m=\frac{F}{a}=\frac{5050 N}{9.71 m/s^2}=520 kg[/tex]

8. 1.00 m/s2

In this case, the net force applied by Amber is F=35 N.

The total mass of the brother+wagon is

[tex]m=32 kg+3 kg=35 kg[/tex]

Therefore, we can find the acceleration of the system by using again Newton's second law:

[tex]a=\frac{F}{m}=\frac{35 N}{35 kg}=1.00 m/s^2[/tex]

9. forward

This is because of the inertia: in fact, the car (and the groceries inside it) is initially moving forward. When it stops, the groceries inside the car tends to continue moving forward: due to their inertia, they tends to continue their motion with constant speed, until they are stopped by an external force.

10. The tendency of an object with mass to resist a change in its motion.

Inertia is exactly this: the tendency of an object with mass to resist a change in its motion. This means that an object at rest tends to stay at rest, while an object in motion tends to keep its speed. The inertia of an object depends only on its mass: the larger the mass, the greater the inertia.

your first answer is

given, Force=180N

Mass= 30kg

force= mass.acceleration

180 = 30 . a

a = 180/30

a = 6m/s²

your 2nd answer is m=f/a ( option A)

When she starts out, he is (40x2.5)= 100 miles ahead of her.

She gains (65-40)= 25 miles on him every hour.

It takes her (100/25)= 4 hours to catch up to him.

It will take Mrs. Cunningham 4 hours to overtake Mr. Cunningham.

To determine how long it will take Mrs. Cunningham to overtake Mr. Cunningham, use the following steps:

1. Calculate the distance Mr. Cunningham travels before Mrs. Cunningham starts:

2. Determine the relative speed at which Mrs. Cunningham is gaining on Mr. Cunningham:

3. Calculate the time it takes for Mrs. Cunningham to cover the distance between them at the relative speed:

Gold and silver are the metals which are malleable,ductile and lustrous .

They are noble metals , noble metals are not affected by acid , oxygen and atmosphere  etc.

Hence gold and silver are suitable for making jewelry.

True. Fossil fuels are being used up faster than the earth can produce them.

Answer;

Explanation;

Cliffs, Arches and stacks are among the features created by wave erosion.

Answer: 1, 2, 5

Explanation:

As weight =w =mg

g= gravitational acceleration on mercury = 3.7m/sec2

Mass of person =m= 70 kg

So w =(70kg)(3.7m/sec2)

w= 259 kgm/sec2

W= 259 N

The weight of a 70.0-kg person on Mercury, where the gravity is less than on Earth, would be 259 N.

To answer the question how much a 70.0-kg person would weigh on Mercury, we need to understand the equation w=mg, where 'w' is weight, 'm' is mass, and 'g' is acceleration due to gravity. On Earth, g = 9.80 m/s², but on Mercury, the gravity is less than that of Earth, and the acceleration due to gravity is about 3.7 m/s². Hence, applying the formula, the weight of a 70.0-kg person on Mercury would be w = (70.0 kg)(3.7 m/s²) = 259 N (Newton).

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by the concept of momentum conservation we can say

if net force on a system of mass is ZERO then its momentum will remain conserved

Here a ball is projected upwards so if we take Ball + Earth as a system then total momentum of the system will remain conserved

Initially when ball is on the surface of earth the system has zero momentum and hence we can say after throwing the ball momentum of earth + ball must be zero

now using same equation we can say

[tex]P_{ball} + P_{earth} = 0[/tex]

[tex]m_1v_1 + m_2v_2= 0[/tex]

given that

[tex]m_1 = 5 kg[/tex]

[tex]v_1 = 2 m/s[/tex]

[tex]m_2 = 6 * 10^{24} kg[/tex]

from above equation velocity of earth will be

[tex]v_2 = \frac{m_1 v_1}{m_2}[/tex]

[tex]v_2 = \frac{5*2}{6 * 10^{24}}[/tex]

[tex]v_2 = 1.67 * 10^{-24} m/s[/tex]

so above will be the recoil speed of earth

Velocity and displacement are vectors. (A and D)

Temperature, volume, and height aren't.

D. Weak Nuclear Force.

Weak Force is named thus because it is weak compared to the Strong Force. However, it is responsible for holding particles that are smaller than a Proton. Hence, this is the force that acts over the shortest distance, typically of the order of [tex]10^{-18}  m[/tex], which is much less than the diameter of a proton.

Answer:

C - Strong Nuclear force

Answer

80 coils

Explanation

The turn rule of a transformer says that, the amount of voltage induced in the secondary coil is proportional to the number of coil. It is simplified by the ratio:

Np/Ns  =  Vp/Vs

200/Ns  = 25,000/10,000

200 × 10,000  = 25,000Ns

2,000,000 = 25000Ns

Dividing both sides by 25,000,

Ns = 2,000,000/25,000

       = 80 coils

Answer:

The answers is 80 Coils

Explanation:

Right on edge

Answer: correct answer is 10 m/s

Explanation:

The two components of the weight of the block is given as

[tex]F_x = mg sin14[/tex]

[tex]F_y = mg cos14[/tex]

now the normal force on the block will be counter balanced by Y component of weight of block

[tex]F_n = mg cos14[/tex]

now to find the friction force we will use

[tex]F_f = \mu * F_n[/tex]

[tex]F_f = 0.380 * mg cos14[/tex]

Now the net force along the inclined plane is given as

[tex]F_{net} = mgsin14 - F_f[/tex]

[tex]F_{net} = mgsin14 - 0.380 mgcos14[/tex]

now the acceleration of block is given by Newton's II law

[tex]a = \frac{F_{net}}{m}[/tex]

[tex]a = gsin14 - 0.380gcos14[/tex]

[tex]a = 9.8(sin14 - 0.380*cos14)[/tex]

[tex]a = -1.24 m/s^2[/tex]

now by using kinematics we will write

[tex]v_f^2 - v_i^2 = 2 a d[/tex]

[tex]0 - 1.70^2 = 2*(-1.24)*d[/tex]

[tex]d = 1.16 m[/tex]

so it will cover the distance of 1.16 m

A box is sliding down an incline tilted at an angle 14.0° above horizontal. The box is sliding down the incline at a speed of 1.70 m/s. The coefficient of kinetic friction between the box and the incline is 0.380. The box slide at 1.16 m down the incline before coming to rest.

The diagrammatic expression of the question given can be seen in the image below.

We need to resolve the component of the plane into parallel and perpendicular forces.

In the parallel direction;

In the perpendicular direction, the normal force N = mg cos θ

The frictional force F = μN

where;

∴

The frictional force F = μ × mg cos θ

Thus, the resultant force in the parallel direction of the plane is:

Similarly, using the second equation of motion

Force of an object = mass × acceleration

∴

Making acceleration (a) the subject of the formula, we have:

acceleration (a) = g(sin θ - μ cos θ)

Finally, using the kinematics equation;

where;

[tex]\mathbf{v^2=u^2+2as }[/tex]

[tex]\mathbf{(0)^2=(1.70)^2+2\times (-1.2427)s }[/tex]

[tex]\mathbf{-(1.70)^2=+2\times (-1.2427)s }[/tex]

Making (s) the subject of the formula:

[tex]\mathbf{s = \dfrac{-(1.70)^2}{2 \times -1.2427}}[/tex]

[tex]\mathbf{s = \dfrac{(1.70)^2}{2 \times 1.2427}}[/tex]

[tex]\mathbf{s = \dfrac{2.89}{2.4854}}[/tex]

s = 1.16 m

Therefore, we can conclude that the distance of how far the box slides down the incline before coming to rest is 1.16 m

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B) It falls at a constant rate of speed.

As a rock falls to Earth, it accelerates due to the constant force of gravity. This results in an increase in its speed by approximately 9.80 meters per second every second. Hence, option A is correct.

The question is: "What can we say about the rock as it falls to Earth?" The correct answer is A) It accelerates as it falls.

When an object, such as a rock, falls towards the Earth, it experiences acceleration due to gravity. This acceleration is constant and has a value of approximately -9.80 m/s², meaning the object's speed increases by about 9.80 meters per second for each second of its descent. This is true as long as we neglect air resistance, which is common in introductory physics problems.

here as it is given that x component of the vector is positive while y component of the vector is negative so we can say the vector must inclined in Fourth quadrant.

So angle must be more than 270 degree and less than 360 degree

Now in order to find the value we can say that

[tex]tan\theta = \frac{opposite\: side}{adjacent\: side}[/tex]

[tex]tan\theta = \frac{8.6}{6.1}[/tex]

[tex]\theta = tan^{-1}1.41[/tex]

[tex]\theta = 54.65^0[/tex]

so it is inclined at above angle with X axis in fourth quadrant

Now if angle is to be measured counterclockwise then its magnitude will be

[tex]\theta = 360 - 54.65 = 305.3^0[/tex]

so the correct answer will be 305 degree

The angle measured counterclockwise from the x-axis to the vector A, given its components Ax = 6.1 and Ay = -8.6, is approximately 305 degrees. This is calculated using the arctangent function with the formula θ=atan(Ay/Ax), and taking an adjustment for the negative angle measurement.

To calculate the angle measured counterclockwise from the x-axis to a vector, we need to use the arctangent function (also known as atan or tan^-1) as it is generally used when dealing with vectors. The formula is usually given as θ=atan(Ay/Ax), where Ay and Ax are the vector's y and x components respectively. Our given components are Ax = 6.1 and Ay = -8.6.

First, we calculate the quotient of Ay/Ax, which is -8.6/6.1. This brings us a negative result, whose arctangent is in the 4th quadrant (270 to 360 degrees). But, typically, when we do this computation, the range of the arctangent function is limited to (-90, 90) degrees or (270, 360) degrees. So, in our case, we get an angle estimation of about -54.51 degrees. But angles are normally measured counterclockwise from the x-axis (increasing from the X-axis towards Y), a negative angle has to be interpreted as clockwise rotation. Hence to get the angle measured counterclockwise, we will add 360 degrees to our value (-54.51 degrees).

The result is -54.51 degrees + 360 degrees = 305.49 degrees. Rounded to the nearest whole number, this gives an angle of approximately 305 degrees.

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Use the equation

[tex]{v_f}^2-{v_i}^2=2a\Delta x[/tex]

The final velocity [tex]v_f[/tex] is 68 m/s, the acceleration [tex]a[/tex] is 8 m/s^2, and the net displacement [tex]\Delta x[/tex] is 33 m, so you can solve for the initial velocity [tex]v_i[/tex]:

[tex]\left(68\,\dfrac{\mathrm m}{\mathrm s}\right)^2-{v_i}^2=2\left(8\,\dfrac{\mathrm m}{\mathrm s^2}\right)(33\,\mathrm m)[/tex]

[tex]{v_i}^2=4096\,\dfrac{\mathrm m^2}{\mathrm s^2}[/tex]

[tex]v_i=64\,\dfrac{\mathrm m}{\mathrm s}[/tex]

To calculate the initial velocity, use the equation Vf^2 = Vo^2 + 2aΔx, where Vf is the final velocity, Vo is the initial velocity, a is the acceleration, and Δx is the displacement. Plug in the given values to find Vo.

To calculate the initial velocity of an object displaced 33 meters while accelerating at 8 m/s^2 and reaching a final velocity of 68 m/s, we can use the equation:

Vf^2 = Vo^2 + 2aΔx

Where Vf is the final velocity, Vo is the initial velocity, a is the acceleration, and Δx is the displacement.

Plugging in the given values:

68^2 = Vo^2 + 2(8)(33)

Vo^2 = 4624 - 528

Vo^2 = 4096

Vo = √4096

Vo = 64 m/s

Here in the given situation two forces are acting on the dummy from two perpendicular directions

Since force is a vector quantity so we need to add two or more forces by vector addition method

Now here we know that two forces are perpendicular to each other

So we will use Pythagoras theorem

[tex]F_{net} = \sqrt{F_1^2 + F_2^2}[/tex]

given that

[tex]F_1 = 130.0 N[/tex]

[tex]F_2 = 4500.0 N[/tex]

now plug in all in the above equation

[tex]F_{net} = \sqrt{130^2 + 4500^2}[/tex]

[tex]F_{net} = 4501.9 N[/tex]

So the sensor will report net force as 4501.9 N

I think the answer is (D)

The electron dot diagram that represents a ionic compound is option c. NaCl is an ionic compound formed through the ionic bonding between sodium metal and chlorine atom.

Ionic compounds are formed between metals and non-metals. The metals are electropositive and easily loss electrons to electron deficient non metals to achieve octet.

When the non-metals gain electrons they acquire a negative charge and metals gain a positive charge by losing electron. These opposite charges electrostatically attracts and form the ionic bond.

NaCl, sodium chloride is an ionic compound formed by donating an electrons from the sodium metal to the Cl atom. Thus, Na becomes Na + and Cl becomes Cl-. Therefore, option c is correct.

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The answer is 86 degrees Fahrenheit.

Hope this helps :)

You know (°Celsius).

Fahrenheit = (1.8 · °Celsius) + 32  =  86°F .

Kelvin = °Celsius + 273.15  =  303.15 Kelvins

Radius of circular track = 0.2 km = 200 m

time to complete one revolution = 2 minutes

so here we can say that velocity is defined as ratio of total distance traveled and total time of motion

Here in one revolution total distance moved will be equal to one circumference

[tex]d = 2\pi R[/tex]

[tex]d = 2 \pi * 200 = 400 \pi[/tex]

[tex]t = 2 min = 120 s[/tex]

now speed is given by

[tex]v = \frac{400 \pi}{120}[/tex]

[tex]v = 10.5 m/s[/tex]

so velocity of scooter is 10.5 m/s

If a rock is dropped from a bridge, its acceleration remains the same (9.8 m/s², the acceleration of gravity on Earth, no matter how heavy the rock is), and its speed increases at the rate of (9.8 meters per second for every second it falls).

The acceleration of the rock remains the same while the speed increases as the rock moves downwards.

The motion of an object dropped from a certain height is affected by Earth's gravitational influence.

The object's speed increases as the object moves downwards and it will eventually become maximum before the object hits the ground.

Thus, we can conclude that the acceleration of the rock remains the same while the speed increases as the rock moves downwards.

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Height of the waterfall is 0.449 m

its horizontal distance will be 2.1 m

now let say his speed is v with which he jumped out so here the two components of his velocity will be

[tex]v_x = vcos35.2 = 0.817 v[/tex]

[tex]v_y = vsin35.2 = 0.576 v[/tex]

here the acceleration due to gravity is 9.81 m/s^2 downwards

now we can find the time to reach the other end by y direction displacement equation

[tex]\Delta y = v_y * t + \frac{1}{2} at^2[/tex]

[tex]-0.449 = 0.576 * v *t - \frac{1}{2}*9.81 * t^2[/tex]

also from x direction we can say

[tex]\Delta x = v_x * t[/tex]

[tex]2.1 = 0.817 v* t[/tex]

now we have

[tex] v* t = 2.57[/tex]

we will plug in this value into first equation

[tex]- 0.449 = 0.576 * 2.57 - 4.905 * t^2[/tex]

[tex]1.93 = 4.905 * t^2[/tex]

[tex]t = 0.63 s[/tex]

now as we know that

[tex]v* t = 2.57 [/tex]

t = 0.63 s

[tex]v = \frac{2.57}{0.63}[/tex]

[tex]v = 4.1 m/s[/tex]

so his minimum speed of jump is 4.1 m/s

A screwdriver is used to insert a screw into a wall stud. Then, using an electric screwdriver, you drive into the wall. The identical task was done, but the electric screwdriver sped up the process.

Therefore, the answer is "Option b".

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The statement which is true about using both a screw driver and an electric screw driver to put a screw in a wall stud is: B. the same work was done, but the electric screw driver increased the rate of work.

Work can be defined as a measure of energy transfer that takes place when an object is moved due to the application of a force along a displacement.

Hence, the work done by an object is the multiplication (product) of the perpendicular force acting on the object and the distance it covers.

Mathematically, work done is given by the formula:

[tex]Work\;done = Force \times displacement[/tex]

Generally, a screw driver and an electric screw driver can be used to perform the same work of put a screw in a wall stud.

However, an electric screw driver has a motor, which makes the speed (work rate) of putting a screw in the wall faster than a screw driver.

Additionally, a screw driver is a mechanical tool and as such it requires more human effort to put a screw in a wall stud, thereby, decreasing the rate of work.

In conclusion, the same work was done by using both a screw driver and an electric screw driver, but the electric screw driver increased the rate of work.

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Final answer:

The minimum distance the gazelle must be ahead of the cheetah to have a chance of escape is 112.5 m.

Explanation:

To find the minimum distance the gazelle must be ahead of the cheetah, we need to calculate the distance the cheetah covers in 7.5 seconds when it reaches its maximum speed.

Using the formula:

Displacement = Initial velocity * Time + (1/2) * Acceleration * Time^2

Since the cheetah starts from rest, its initial velocity is 0 m/s. The acceleration is not given in the question, so we can't calculate the exact distance. However, we can use the example provided, where the cheetah accelerates at 4 m/s², to illustrate the calculation.

Let's assume the cheetah's acceleration is 4 m/s². Plugging in the values:

Displacement = (0 m/s) * (7.5 s) + (1/2) * (4 m/s²) * (7.5 s)^2

Displacement = 0 + (1/2) * 4 m/s² * 56.25 s²

Displacement = 0 + 2 * 56.25 m = 112.5 m

Therefore, the minimum distance the gazelle must be ahead of the cheetah is 112.5 meters.