The acceleration due to gravity is -9.8 m/s^2. What variable is dedicated to this constant?

creativ13 [48]

Atoms are a single entity (one type of element) whereas a molecule is a group of 2 or more atoms chemically bonded. Don't be confused that atoms are a single particle because they can be split into protons, neutrons and electrons.

5 0

3 years ago

A block has two strings attached to it on opposite ends. One string has a force of 5 N,

juin [17]

Unless you have a diagram to include or any other additional info, I'll assume the block is being pulled by two opposing forces along the horizontal surface.

Horizontally, the block is under the influence of

• one rope pulling in one direction with magnitude 15 N,

• the other rope pulling in the opposite direction with mag. 5 N, and

• friction, opposing the direction of the block's motion, with mag. 3 N.

It stands to reason that the block is accelerating in the direction of the larger pulling force.

(A) By Newton's second law, we have

15 N + (-5 N) + (-3 N) = m (1 m/s²)

where m is the mass of the block. Solve for m :

7 N = m (1 m/s²)

m = (7 N) / (1 m/s²)

m = 7 kg

(B) The friction force is proportional to the normal force, so that if f is the mag. of friction and n is the mag. of the normal force, then f = µ n where µ is the coefficient of friction.

The block does not bounce up and down, so its vertical forces are balanced, which means the normal force and the block's weight (mag. w) cancel out:

n + (-w) = 0

n = w

n = m g

where g = 9.8 m/s² is the mag. of the acceleration due to gravity.

n = (7 kg) (9.8 m/s²)

n = 68.6 N

Then

3 N = µ (68.6 N)

µ = (3 N) / (68.6 N)

µ ≈ 0.044

4 0

3 years ago

Hello, can somebody tell me the physical flow quantities besides the 7 basic ones?

baherus [9]

Answer:

There are seven fundamental physical quantities they are: length, mass, time, electric current, temperature, amount of substance, and light intensity.

8 0

3 years ago

If a pitch vibrates at 880 cycles, the octave below would vibrate at ____ cycles. 220 440 660 1760

eduard

Answer:

If a pitch vibrates at 880 cycles, the octave below would vibrate at 440 cycles.

Explanation:

Pitch of sound is defined as relative highest and the lowest point of sound. The pitch is dependent on frequency of vibration.

Octave is defined as a tone which is formed due to merging of two different tone. The resultant tone is merged so well that it sound like a single tone.

Thus, Number cycle in octave = $\frac{number of cycles in a pitch}{2}$

Number cycle in octave = $\frac{880}{2}$

Number cycle in octave = 440

Thus, If a pitch vibrates at 880 cycles, the octave below would vibrate at 440 cycles.

7 0

3 years ago

A particle undergoes two displacements. The first has a

Novay_Z [31]

First you need to draw the picture of the problem to better understand it. Like the one bellow.

In this task you have 2 sides of triangle and we can calculate angle between them. Angle between them is 120 - 35 = 85 degrees.

Once you have those 3 variables you can calculate third side of triangle using cosine law.
a - second displacement
b - first displacement
c- resultant displacement.

$a^{2} = b^{2}+ c^{2}-2*b*c*cos85$
now we just need to calculate this.
$a^{2} = 38439.458$
a = 196

now, we use cosine law again to find the angle between second and first displacement.
$\alpha = 45.36$ degrees

The angle marked with "?" in the graph is our direction angle. We will call it $\beta$

$\beta =90-30-45.36 = 14.64$

Second displacement has magnitude of 196 and a direction of -14.64 with positive x axis

3 0

3 years ago