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-BARSIC- [3]
3 years ago
8

Which expression represents the sum of 8 and twice a number 8+n 8+2n 8×2n 2×(8+n)

Physics
1 answer:
Lynna [10]3 years ago
7 0

Answer:

8 + 2 n (second expression listed)

Explanation:

Since we don't know the number, we represent it with a letter (n).

Twice a number (two times that number) will therefore be: 2 n.

and the addition (sum) of 8 to such will lead to 8 + 2 n

The sum of 8 and twice a number is : 8 + 2 n

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A magnetic field is a force field, invisibly pushing electrically charged objects just as a gravitational field pulls objects with mass. Whereas all objects with mass exert a gravitational field, however, not all objects have a magnetic field. Magnetic fields are created by electrical charges. Thanks to their structure at the atomic level, some substances -- like the iron in magnets -- have a permanent magnetic field.
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4 years ago
For the sign show, select the statements below that describe the situation. Choose all that apply. The system is in equilibrium
horrorfan [7]

Answer:

A and D

Explanation:

I believe it is A and D because they appear to be the most accurate answers.

3 0
3 years ago
A student throws a ball upward with a velocity of 35 m/s. What is the acceleration of the ball as it rises to the top of its arc
lora16 [44]

Answer:

The acceleration of the ball as it rises to the top of its arc equals 9.807 meters per square second.

Explanation:

Let suppose that maximum height of the arc is so small in comparison with the radius of the Earth.

Since the ball is launched upwards, then the ball experiments a free-fall motion, that is, an uniform accelerated motion in which the element is accelerated by gravity. Then, the acceleration experimented by the motion remains constant at every instant and position.

Besides, the gravitational acceleration in the Earth and, in consequence, the acceleration of the ball as it rises to the top of its arc equals 9.807 meters per square second.

7 0
3 years ago
A race car moves along a circular track at a speed of 0.512 m/s. If the car's centripetal acceleration is 15.4 m/s2, what is the
tiny-mole [99]

Answer:

The radius is  r = 0.0170 \ m  

Explanation:

From the question we are told that

      The speed at which the race car moves is v  =  0.512 \ m/s

       The centripetal acceleration is  a _r  =  15.4 \ m/s

Generally the centripetal acceleration is mathematically represented as

           a_r =  \frac{v^2 }{r}

=>        15.4  =  \frac{0.512^2 }{ r}

=>       r = 0.0170 \ m  

 

6 0
3 years ago
In the absence of a gravitational field, you could determine the mass of an object (of unknown composition) by:
lina2011 [118]

Answer:

A) By applying a known force, and measuring it's acceleration.

Explanation:

This is actually something that astronauts do in space as a mathmatical exercise when calculating the mass of an object since F = m × a.

Once the force, and acceleration are applied, the only unknown is the mass which can be solved by dividing force over acceleration. This is because inertial mass is equal to gravitational mass.

3 0
3 years ago
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