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3 years ago

8

If a freely falling rock were equipped with a speedometer, by how much would its speed readings increase with each second of fal

l?

1 answer:

Klio2033 [76]3 years ago

5 0

Its speed reading would increase to 10 m/s every second

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The coefficient of kinetic friction between an object and the surface upon which it is sliding is 0. 10. The mass of the object

lilavasa [31]

The force of friction is 78.4 N

What is force of friction?

Frictional force is the force created when two surfaces come into contact and slide against each other. it is given by the equation:

$F_{f} =$ μ * $F_{n}$

where,

$F_{f}$ = force of friction

μ = coefficient of friction

$F_{n}$ = normal force

Given,

μ $= 0.10, m = 8.0 kg$

We know,

$F_{n} = mg$

$F_{n} = 8.0 * 9.8\\\\ F_{n} = 78.4 N$

Subsituing the values in equation:

$F_{f} =$ μ * $F_{n}$

$F_{f} = 0.10 * 78.4 \\\\F_{f} = 7.84 N$

The force of friction is 78.4 N.

To know more about force of friction, check out:

brainly.com/question/24386803

#SPJ4

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10 months ago

What is the force of gravity between two 40.0kg masses that are separated by 3.00m?

Slav-nsk [51]

Answer:

$f = g \times \frac{m1 \times m2}{ {d}^{2} }$

$f = 6.67 \times {10}^{ - 11} \times \frac{40 \times 40}{9}$

<h2>F=1.2x 10^-8</h2>

3 0

2 years ago

How are magnetic forces like electric forces? (4 points) Select one: a. They both have charges b. In both, opposites attract. c.

nlexa [21]

Lets take it down a notch and break it down:

Magnetic forces and electric forces are quite similar, lets take a look at the answers possible:

A. They both have charges

False, magnetic forces do not HAVE charges, but they have an EFFECT on moving charges (that are creating a magnetic field around them).

Why? Electrical forces have positive and negative charges while magnetic forces have a north and south POLE. These two are different forces, therefore magnetic forces do not HAVE charges.

B. In both, opposites attract

We all know opposite poles attract, like poles, don't attract (repelling force). This is true for the magnetic force, now, the electric force, two positively charged particles will exert a repulsive force on one another. DING DING. We have a winner. <u>B is TRUE.</u>

C. In both, opposites repel

False, we already know in electric and magnetic forces that opposites attract and similar charges/poles repel.

D. Neither have charges

False, this is a joke question right? Don't even look at this one!!!!!!!!!

<u>Therefore, </u><u>B</u><u>, is the only true answer that describes how magnetic and electric forces are similar. </u>

Have a nice day!

6 0

3 years ago

How much energy is evolved during the reaction of 48.7 g of al, according to the reaction below? assume that there is excess fe2

alex41 [277]

<span>The standard DH for this reaction is -852 kJ/rxn. When attacking a problem like this, the first thing to always do is to convert grams (which is a unit of measurement) into moles (which is a unit of chemistry). The atomic weight of aluminum is 26.98 g/mol, so you can divide your mass by the molecular weight to find that you have 1.81 mol of aluminum. Note then that you use up two moles of aluminum per reaction cycle (as defined by the coefficient), so you can divide your number of moles of aluminum by 2 mol Al/rxn. So now you know that you have enough aluminum for .903 reaction cycles, so you can multiply your standard enthalpy by the number of reaction cycles that can progress, and you should end up with a total of -769 kJ of energy, which equates to a release or evolution (rather than an absorption) of 769 kJ of energy.</span>

5 0

3 years ago

There are seven fundamental quantities in physics. true or false

Gemiola [76]

Answer:

True

Explanation:

mass, length, time, electric current, temperature, luminous intensity and amount of substance

6 0

2 years ago