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3 years ago

Which of the following is an example of a primary source?

Physics

1 answer:

astra-53 [7]3 years ago

6 0

Answer:

scientific journal

in my guess

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; (b) A uniform beam 150cm long weighs 3.5kg and

noname [10]

Explanation:

(b) A uniform beam 150cm long weighs 3.5kg and

supported on knife-edges at its ends. The beam

supports a weight 7kg at a distance 30cm from

one end. Find the reactions of the supports.

4 0

3 years ago

How much work is done by the force that moves the charge?

mina [271]

Answer:

The work done by the force is 6μJ

Explanation:

Suppose, A 30 nC charge is moved from a point where V₁ = 130 V to a point where V₂ = -70 V.

We need to calculate the work done by the force

Using formula of work done

$W=-q\Delta V$

Where, q = charge

$\Delta V$ =potential difference

Put the value into the formula

$W=-30\times10^{-9}\times(-70-130)$

$W=0.000006\ J$

$W=6\times10^{-6}\ J$

$W=6\ \mu J$

Hence, The work done by the force is 6μJ.

6 0

4 years ago

Which statement correctly describes the difference between an atom and a molecule

Alisiya [41]

Answer:

In a molecule, atoms are bonded together by single, double, or triple bonds. An atom has a nucleus surrounded by electrons.

Explanation:

3 0

3 years ago

A 5.0 g coin is placed 15 cm from the center of a turntable. The coin has static and kinetic coefficients of friction with the t

Kaylis [27]

Answer:

Angular speed will reach 6.833rad/s before the coin starts slipping

Explanation:

There is no question but I'll asume the common one: Calculate the speed of the turntable before the coin starts slipping.

With a sum of forces:

$Ff = m*a$

$Ff=m*V^2/R$

At this point, friction force is maximum, so:

$\mu*N=m*V^2/R$

$\mu*m*g=m*V^2/R$

Solving for V:

$V=\sqrt{\mu*g*R}$

V=1.025 m/s

The angular speed of the turntable will be:

ω = V/R = 6.833 rad/s This is the maximum speed it can reach before the coin starts slipping.

7 0

3 years ago

What direction does centripetal acceleration point?

Nesterboy [21]

Answer:

Inward

Explanation:

As the centripetal force acts upon an object moving in a circle at constant speed, the force always acts inward as the velocity of the object is directed tangent to the circle. This would mean that the force is always directed perpendicular to the direction that the object is being displaced. hope this helps :)

3 0

3 years ago