Suppose the acceleration of an elevator is 1/2 g upward, then what is the reading on the scale in the elevator.

a. 1/2 mg
b. 2 mg
c. 3/2 mg
d. m

Answer:

D :)

Explanation:

When an impact causes the car to suddenly change its motion, (D) the people in the car will continue to move in the same direction and at the same speed as before the impact.

Newton's first law of motion states that Unless influenced by an imbalanced force, a body at rest stays at rest, and a body in motion keeps moving in a straight path at a constant pace. This law is commonly known as law of inertia and the resistance of a body to maintain its state of rest is called inertia of rest, same as, the resistance of a body to maintain its state of motion is called inertia of motion.

When a car is moving with certain speed, the car along with the people inside the car is in inertia of motion. In an event of accident, the car comes in rest in no time but the man in the car is still in inertia of motion. So, his body moves forward in the car which may cause injuries. To prevent such injuries, the people inside a car are advised to use safety belts.

So, correct answer  is option (D).

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Answer:

57.3N

Explanation:

Given parameters:

radius of the path = 3m

tangential speed  = 2m/s

mass of the bicycle and child  = 43kg

Unknown:

centripetal force  = ?

Solution:

The centripetal force is the inward force on a body round a circular path.

It is expressed as;

    F  = [tex]\frac{mv^{2} }{r}[/tex]  

F is the centripetal force

m is the mass

v is the tangential speed

r is the radius

        F  = [tex]\frac{43 x 2^{2} }{3}[/tex]   = 57.3N

Time required for the car to reach a speed of 90 km/h is 4.165 seconds.

To solve for time, use the formula for time, t = d/s which means time equals distance divided by speed.4.165 sec

In light of the posed query,

Initial velocity is 60 km/h, which is 60 x 1000 / 36600, or 16.67 m/s.

90 km/h is equal to 901000/3600, or 25.

2 m/s2 for acceleration, or a.

t = time

We are also asked to determine how long it will take the car to

accelerate to its final speed of 90 km/h.

We are aware,

v = u+at

Given the values we receive,

25 = 16.67 + 2t

2t = 25-16.67

2t = 8.33

t = 8.33/2

t = 4.165 sec

Thus, the car will take 4.165 sec to attain the final velocity of 90 km/h if its acceleration is 2 m/s^2 and initial velocity is of 60 km/h.

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Answer:

the mantel

Explanation:

yeeeeaaaaaaa

Answer:

Radiation

Explanation:

Radiation is the transfer of heat through waves. (Fire's hot air/waves warms you)

Not conduction because you have to come in direct contact with the fire in order to be considered conduction.

Not convection because those happen when heat causes a difference in densities, allowing substances to circulate.

Answer:

[tex]\huge\boxed{\sf P.E. = 14700\ Joules}[/tex]

Explanation:

This work done is in the form of Potential Energy so we'll use the formula of Potential Energy.

Given Data:

Mass = m = 250 kg

Acceleration due to gravity = g = 9.8 m/s²

Height = h = 6 m

Required:

Work Done in the form of Potential Energy = P.E. = ?

Formula:

P.E. = mgh

Solution:

P.E. = (250)(9.8)(6)

P.E. = 14700 Joules

[tex]\rule[225]{225}{2}[/tex]

Hope this helped!

Answer: 31kg

Explanation:

(F=mxa)

Rearranged

M=f÷a

961÷31=31

Answer:

D.

Explanation:

the friction will cause the ball to stop moving which is a change

The magnitude of the force that one particle exerts on the other = [tex]6.8644 \times 10^{13}[/tex] N

Charge of one particle,[tex]Q_1[/tex] = -3.77  μC

Charge of the other particle,[tex]Q_2[/tex]  = 6.91 μC

The opposite signs of the charges implies the presence of force of attraction between the particles.

Given distance between particles, r = 5.84 cm = 0.0584 m

Coulomb's law states that the magnitude of the force exerted between two particles is directly proportional to the product of magnitude of charges of the particle and inversely proportional to the square of the distance between the particles.

From this we can infer the equation, [tex]F=\frac{kQ_1Q_2}{r^2}[/tex]

where F is the force between the particles and k =[tex]9\times 10^9 Nm^2C^{-2}[/tex] is the Coulomb's Constant.

So F = (9 x 10^9 x 3.77 x 6.91)/(0.0584 x 0.0584)

        = [tex]6.8644 \times 10^{13}[/tex] N

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Explanation:

V=u+at

where,

v=final speed

u=initial speed,(starting speed)

a=acceleration

t=time

6=2+2a

2a=6-2

2a=4

a=4/2 = 2

a =2

2. to find time taken

v=u+at

25=5*2t

2t=25-5

2t=20

t=20/2

t=10sec

3. finding final speed

v=u+at

v=4+10*2

=4+20

v=24m/sec

5.v=u+at

=5+8*10

=5+80

V=85m/sev

6. v=u+at

8=u+4*2

8=u+8

U=8/8

u=1

these are your missing values

Answer:1m/s2

Explanation:

Answer:

Kinetic Energy and Mechanical energy

Explanation:

The vector electric field is [tex]-1.73 \times 10^{4} {~}\hat{j} {~}N/C[/tex] .

A stream of charged particles, such as electrons or ions, flowing through an electrical conductor or a vacuum is known as an electric current.

One long wire carries a current I = 30.0 A to the left along the x-axis. I' = 50.0 A of current is being carried by a second lengthy wire to the right along the line (y = 0.280 m, z = 0).

Now,

The charge of a particle is q = - 2.00 μC which is moving with a velocity of [tex]v = 150\hat{i} {~}Mm/s[/tex].

At y = 0.1 m the total magnetic field is:

B = 1.16 × 10⁻⁴ T

Then the force on the particle is:

F =q(v × B)

[tex]F = (-2 \times 10^{-6} )[ ( 150 \times 10^{6})\hat{j} \times (1.16 \times 10^{-4})\hat{k} ][/tex]

F = 3.47 × 10⁻² N

A uniform electric field is applied.

Then the vector electric field will be:

F = qE

3.47 × 10⁻² = (-2 × 10⁻⁶ )E

[tex]E = -1.73 \times 10^{4}{~}\hat{j} {~}N/C[/tex]

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Answer:

I think its D.

Explanation:

Answer:

(a) 180 km

(b) 30km

Explanation:

To find displacement (in this case, kilometers) you need to convert km/h to km, this can be done by multiplying by the amount of hours:

[tex]\frac{60km}{h}*3h=60km*3=180km \\\frac{60km}{h} *h/2 = 60km/2=30km[/tex]

(The h/2 term came from 1/2*h, since half an hour is h*1/2)

Answer:

Qualitative research can identify key variables in which regards as findings. Such findings may put into a conceptual framework or a research framework, later stage, that research framework can be tested via various statistical methods such as correlation, structural equation modelling ect. Because, qualitative research do not prove any significant relationship among variables, but quantitative research do. However, based on data gathered in qualitative research, the researcher can show that there may have some relationships among variables through graphically or by using NVivo qualitative data analysis software.

Explanation:

creds to Roshan Panditharathna

You can determine the qualitative relationship that may exist in data because qualitative describes key qualities and characteristics using questionnaires, observation or interviews. On the other hand quantitative relationships are based off of numbers and are collected using graphs and charts.

Answer:فربما الى اغبر وابقاء على كل من اراد من دون اي نية لا اريد له الزواج او غيره او لا ربرلرل

الفيفي قثصشسيبزروت

Explanation:١٤٢٣٦٧٧٨٩

Answer:

An example of a hypothesis based on observation and scientific principles is:

Deaf children whose parents are deaf will acquire language faster than deaf children whose parents are not deaf.

A hypothesis is an informed prediction or a tentative statement about what you think that would occur in a scientific experiment as a result of experience from observations accepted by scientific rules and law.

A hypothesis is a testable statement obtained from the research question but questions cannot be tested directly, it is the proposed relationship between the variables that are tested.

An example of a hypothesis is:

Deaf children whose parents are deaf will acquire language faster than deaf children whose parents are not deaf.

This specifies the direction of the hypothesis because one group is faster than the other.

Explanation:

Answer:

All light pass through them

Explanation:

hope it helps u :) hv a great day

Answer:

[tex]\rightarrow[/tex] Electric motors build energy through the interaction between magnetic fields.

Magnetic fields may be generated by passing a current through a wire. Winding that wire into a coil intensifies the sector. Wrapping the coil around an iron core can intensify it more. One is going to be of the coil are North, the other South. Reverse the flow of current through the coil. The magnetic poles can swap. Place 2 separate coils close to one another and organize them therefore one turns whereas the opposite is fastened. Then build arrangements for this within the moving coil to reverse even as the opposite poles are about to line up.

Hope it helps!<3

93.64 grams

Explanation:mass of platinum =number of moles x molar mass molar mass = atomic mass of any element ,0.48 ×195.084 = 93.64 grams

Answer: 160 km

Explanation:

Answer:

According to Newton's second law of motion, the acceleration of an object equals the net force acting on it divided by its mass, or a = F m . This equation for acceleration can be used to calculate the acceleration of an object when its mass and the net force acting on it are known

Explanation:

Answer:

Nuclear reactors are the heart of a nuclear power plant. They contain and control nuclear chain reactions that produce heat through a physical process called fission. That heat is used to make steam that spins a turbine to create electricity

~+lil more info!+~

What material is used to power a nuclear reactor?

uranium !

All commercial power reactors are based on nuclear fission. They generally use uranium and its product plutonium as nuclear fuel, though a thorium fuel cycle is also possible.

The n-th place is 2×10 −4 m

The diffraction pattern's minima is

nDλ =(3−1) d

Dλ = d

2Dλ

​ d= x 3 −x

​ 2Dλ = 3×10 −3

2×0.50×6000×10 −10

=2×10 −4 m

Diffraction of light, as it is used to describe light, occurs more explicitly when a light wave passes by a corner or via an aperture or slit that is physically

Light is diffracted primarily as a function of wavelength (frequency), amplitude, and slit width. The incident waves must have a larger amplitude than the slit width for any diffraction to take place. Diffraction won't happen if the wave is less than the slit width.

The quantity of diffraction increases with the wave's wavelength. When the gap size is almost equal to the wavelength, the most 2×10 −4 m occurs.

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Answer:

that's your 1st cousin which is your mom or dad's sibling's child sooo when you're that close and that related i would say that that would be the reason why.

Explanation:

hoped that helped!!