A barbel weighing 215N is raised to a height of 2.0 M above the ground. It is then dropped from that height.
A. What is the kinetic energy of the barbell as it hits the floor?
B. What is the velocity of the barbell as it hits the floor?

Answer:

C. Radio waves have longer wavelengths and lower frequencies than microwaves.

Explanation:

Radio waves and microwaves are both electromagnetic waves. They do not require a medium for their propagation.

These waves are produced as result of the vibration between electric and magnetic fields perpendicular to one another.

Answer:

The value is  [tex]t = 18.6 s[/tex]

Explanation:

From the question we are told that

     The average acceleration of the bicycle is [tex]v = -0.44 \ m/s^2[/tex]

      The initial forward velocity is  [tex]u = 8.2 \ m/s[/tex]

Generally from kinematic equations we have that

      [tex]v = u + at[/tex]

Here v is the final velocity of the bicycle and the value is v = 0 m/s

So

      [tex]0 = 8.2 + (-0.44)t[/tex]

=>    t = 18.6 s

Answer:

D: Heat from the water moves into the ice

Answer:

D

Explanation:

Because the molecules of a solid is going to separate form each other because of the hotness of the water and then that’s how the ice cubes would melt

Answer:

c. 3/2 mg

Explanation:

Given that the acceleration of an elevator is 1/2 g upward.

The reading on the scale of the elevator is the net external force acting on the elevator.

Let the force F acting on the elevator as shown,

By using Newton's 2nd law, [tex]F_{net}=ma[/tex]

where, [tex]F_{net}[/tex] is the net force acting on the elevator.

m is the mass of the elevator,

a is the acceleration of the elevator, as given a=1/2 g upward.

So, [tex]F_{net}=m\times \frac 1 2 g[/tex]

[tex]F-mg=m\times \frac 1 2 g \\\\F=mg+ \frac 1 2 mg \\\\F= \frac 3 2 mg.[/tex]

So, the reading on the scale in the elevator is [tex]\frac 3 2 mg[/tex].

Hence, option (c) is correct.

Answer:

white noise is a random signal having equal intensity at different frequencies, giving it a constant power spectral density

Answer:

White noise refers to sounds that mask other sounds that might occur naturally in an environment. If you live in a city, for example, white noise could help block out noises associated with traffic. Specific sounds might be used to help encourage sleep regardless of environmental noises.

Answer:

2m/s

Explanation:

Given parameters:

Mass of car  = 400kg

Momentum  = 800kgm/s

Unknown:

Speed of the car  = ?

Solution:

The momentum of a car is amount of motion it posses;

      momentum  = mass  x velocity

  Insert the parameters and solve;

         800  = 400 x v

             v  = 2m/s

Answer:

Answer is A :)))))))))

the actual diameter of the object is 1.017×10⁵km

actual diameter, d = any line segment that passes through the center of the circle

angular diameter, θ = the angle that an actual diameter of an object makes.

distance, D= the actual path travel

distance of the object ,D= 1.4 billion = 1.4×10⁹km

angular diameter of an object,θ = 15arc

                            θ  = 15 ×π/ (60×60×180) rad

                                                 [ ∵ 1 revolution = 2π = 360°×60×60]

   Using the relation,

     θ = d/D   {angular diameter = actual diameter/ distance}

     d =  θD

      d =  1.4×10⁹×[15×3.14/(60×60×180) ] km

         =  1.017×10⁵km

This shows the actual diameter of the object is  1.017×10⁵km

It is the physical size of object.

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Answer:

when A and B are travelling opposite directions

Answer:

A) Mechanical energy is converted into sound and thermal energy when the hands make contact

B) Mechanical Energy used to flip the switch sets off the lever which converts into Electrical Energy. Once the light is turned on, the Electrical Energy is converted into thermal energy, light energy, and a little bit of sound energy.

Answer:

theres a mouse lol

no

the occurrence of a natural electrical discharge of very short duration and high voltage between a cloud and the ground or within a cloud, accompanied by a bright flash and typically also thunder.

Explanation:

The infra-red detectors are made from thermocouples soldered to blackened metal plates. These are connected to galvanometers.

A galvanometer measures electric current electromechanically. Early galvanometers were not calibrated, but later models, called ammeters, were, and could measure current flow more precisely.

A galvanometer functions by deflecting a pointer in response to an electric current running through a coil in a steady magnetic field. Galvanometers can be viewed as a particular type of actuator.

The discovery that a magnetic compass needle deflects when near an electric current-carrying wire led to the invention of galvanometers, which was made by Hans Christian rsted in 1820. They were the first tools used to find and gauge minute currents. The apparatus was given the name Luigi Galvani by André-Marie Ampère after the Italian electricity researcher who, in 1791, discovered it.

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Answer:

[tex]a_{moon}=5.84m/s^{2}[/tex]

Explanation:

In order to solve this problem, we will need to draw a free body diagram of both situations (see attached picture).

So first, we need to find what the mass of the object is. We can do so by analyzing the horizontal movement of the first situation, so we get:

[tex]\sum F_{x}=ma[/tex]

F=ma

[tex]m=\frac{F}{a}[/tex]

so

[tex]m=\frac{15N}{6.4m\s^{2}}[/tex]

m=2.34kg

next, we can analyze the second situation, we will start by analizing the vertical movement so we can determine the Normal force, so we get:

[tex]\sum F_{y}=0[/tex]

[tex]N-W=0[/tex]

N=W

N=mg

[tex]N=2.34kg(1.62 m/s^{2}[/tex]

N=3.79N

so now we can analyze the horizontal movement of the block, so we get:

[tex]\sum F_{x}=ma[/tex]

[tex]F-N\mu _{k}=ma[/tex]

[tex]a=\frac{F-N\mu_{k}}{m}[/tex]

[tex]a=\frac{15N-(3.79N)(0.35)}{2.34kg}[/tex]

[tex]a=5.84 m/s^{2}[/tex]

Mars has a thin atmosphere.

Answer:

31.25 meters in a time of 2.5 seconds.

Explanation:

Because your question gives a number that is a multiple of 5, that is just begging for us to set a = -g = -10 m/s^2. This is acceleration due to gravity. Then, we have an equation vf = v0 + at where v0 = 25 m/s. Plugging in the earlier known values and letting vf = 0 (when final velocity is zero there is maximum height), we get t = 2.5 s. Then, Delta y = vot - 1/2 gt^2. This gives 62.5 - 31.25 = 31.25 m.

Thus, our answer is 31.25 meters in a time of 2.5 seconds.

*Note: g is more precisely 9.806 m/s^2, but that would lead to more annoying sig figs in our answer so I chose to round to 10 m/s^2 which is common.

the resultant force is F=F1-F2.

F1 = 20 N, and F2 = 50 N

In this instance, two different resultant forces are feasible.

when the two are at an angle of A with one another.

See the outcome in case 1 of the image if both are facing the same way. if they are both facing the opposite directions. when both are at a zero-degree angle from one another If they are parallel to one another and moving in the same direction, the resultant force is F=F1+F2. If they are parallel but moving in the opposite direction, the resultant force is F=F1-F2.

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Answer:

0.144

Explanation:

Impulse is defined as force multiplied by time

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Computer-enhanced x-rays are called CT scans.

A CT scan is a computer-based technology and refers to the inside image of the body generated by using X-rays and advanced scientific technology.

The image shows detailed information about various body parts including bones, organs, blood vessels, veins, fat, and muscles.

CT scans are more advanced, innovative, and detailed technology compared to standard X-ray techniques.

Experts performing CT scans are known as radiology technologists or radiographers.

It differs from CAT which is the reduced form of Computer Axial Tomography.

The major difference between CT scan and MRI is that CT scan uses X-rays while MRI uses magnetic fields.

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Answer:

D. 4Al + 3O2 → 2Al2O3

Explanation:

Chemical reactions involves the chemical combination of two or more substances called REACTANTS to yield other substances called PRODUCTS. However, in accordance with the LAW OF CONSERVATION OF MASS, the amount of reactants must be equal to that of the products.

To accomplish this, the reaction must be BALANCED. A balanced equation is an equation in which the number of atoms of each element in the reactant side equals the number of atoms in the product side. In this reaction involving Aluminum and Oxygen to give Aluminum oxide as follows:

Al + 02 → Al2O3

A coefficient is used to balance the number of atoms on both sides of the equation as follows:

4Al + 3O2 → 2Al2O3

Answer:

here for points

3u3784y297y4ui3t7

Explanation:

Circut C have most electrical power, the product of the voltage and current is highest for circuit C.

Electric Power:

It can be defined as the product of the voltage and current.

P = V x I

For circuit C

P =  4.6 x 0.6 = 2.76

Since, the product of the voltage and current is highest for circuit C.

Therefore, circut C have most electrical power.

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Answer:

4-12x

Explanation:

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By electric flux, the electric field is 41.36 x 10⁵ N/C

We need to know about electric flux to solve this problem. Electric flux is the measure of the electric field through a given surface, although an electric field in itself cannot flow. It can be determined as

Φ = E . S = E . Scosθ

where Φ is electric flux, E is electric field, θ is angle of surface and S is surface area.

From the question above, we know that

Φ = 5.20 × 10⁵ N.m²/C

d = 0.4 m²

r = 0.2 m²

because of maximum flux, hence (cosθ = 1)

By substituting the following parameter, we get

Φ = E . Scosθ

5.20 × 10⁵ =E  . π.r²

5.20 × 10⁵ =E . π.0.2²

E = 41.36 x 10⁵ N/C

Hence, the electric field is 41.36 x 10⁵ N/C

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Answer:

19.1 secs

Explanation:

The first step is to calculate the velocity

= 17.4/47.6

= 0.37 m/s

Therefore the time taken for the person to reach the top can be calculated as follows

= 17.4/(0.37+0.541)

= 17.4 / 0.911

= 19.1 secs

Hence the time taken is 19.1 secs

Answer:

6.4 kg

Explanation:

From Newton's second law of motion,

F = ma

or, 63 = m * 9.8

or, 63÷9.8 = m

or, m = 6.4

Answer: A

Explanation: continents move very slowly, about one inch per year

Answer:

A

Explanation:

it takes thousands of years to see the continents progress in it's movement. by the time we see progress of how they are moving you'd have been dead for 50000 years XD

Answer:0

Explanation:

All stationary objects have no momentum they do not have any motion to have momentum you need mass and motion

Answer:

E) 800 km/h

Explanation:

The computation of the average vector velocity module of the plane, at that time is shown below:

The displacement vector is

d^2 = d1^2 + d2^2

where,

d1 = northeast displacement

d2 = southeast displacement

Now

d^2 = (120)^2 + (160)^2

= 14400 + 2560

= 40000

= √40000

d = 200 km

Now the average velocity is

V = ΔS ÷ Δt

= 200 ÷ 1 ÷ 4

= 200 × 4

=  800 km/h

Answer:

1 x 10¹⁷

Explanation:

Given data:

        Radius of the earth  = 6000km

        Radius of an atom  = 60pm

Now, how many orders is the radius of the earth larger than an atom

Solution:

To solve this problem, let us express both quantity as the same unit;

         1000m  = 1km

    6000km  = 6000 x 10³m   =  6 x 10⁶m

    60pm;

            1 x 10⁻¹²m  = 1pm

    60pm  = 60 x  1 x 10⁻¹²m  = 6 x 10⁻¹¹m

Now;

The order:   [tex]\frac{6 x 10^{6} }{6 x 10^{-11} }[/tex]   = 1 x 10¹⁷