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Neko [114]
3 years ago
8

Which of the following statements is false? A. Two or more atoms combine chemically to form a molecule. B. Two or more different

substances combine physically to form a mixture. C. Two or more different atoms combine chemically to form an element. D. Two or more elements combine chemically to form a compound.
Physics
1 answer:
SCORPION-xisa [38]3 years ago
7 0
<span>C. Two or more different atoms combine chemically to form an element.</span>
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A frog hops 5m east and 2m north. What is the magnitude of the frogs total displacement in m?
TiliK225 [7]

As per the question a frog jumps 5 m towards east.

Frog again jumps 2 m north.

Let the displacement along east is denoted by vector A and the displacement towards north is denoted as vector B.

Hence magnitude of A = 5 m

           Magnitude of B = 2 m

We are asked to calculate the total displacement.

Here the angle between them is 90 degree as A is towards east and B is towards north.

As per parallelogram law of vector addition,the magnitude of total displacement [R] will be-

                            R=\sqrt{ A^{2} +B^{2}+2AB\cos\theta}

                            =\sqrt{ 5^{2}+ 2^{2}+2*5*2 cos 90}

                            =\sqrt{25+4+0} m  [cos90= 0]

                            =\sqrt{29} m

                            = 5.38516 m   [ans]

                     


7 0
3 years ago
Calculate the magnitude of the electric field 2.00 m from a point charge of 5.00 mC (such as found on the terminal of a Van de G
MakcuM [25]

Answer:

The magnitude of the electric field is 1.124 X 10⁷ N/C

Explanation:

Magnitude of electric field is given as;

E = \frac{kq}{r^2} , N/C

where;

E is the magnitude of the electric field, N/C

q is the point charge, C

k is coulomb's constant, Nm²/C²

r is the distance of the point charge, m

Given;

q = 5mC = 5×10⁻³ C

r = 2m

k = 8.99 × 10⁹ Nm²/C²

Substitute these values and solve for magnitude of electric field E

E = \frac{kq}{r^2}  = \frac{(8.99 X10^9)(5X10^{-3})}{2^2}  = 1.124 X10^7 N/C

Therefore, the magnitude of the electric field is 1.124 X 10⁷ N/C

7 0
3 years ago
A car of mass 1200 kg, moving with a speed of 72 mph on a highway,
Keith_Richards [23]

momentum(p) = mass(m) x velocity(v)

KE = kinetic energy = 1/2 mv²

a.

the ratio of the momentum of the SUV to that of the car

\tt \dfrac{mv}{1.5m\dfrac{2}{3}v }=1:1

b.  the ratio of the KE of the SUV to that of the car

\tt \dfrac{1/2\times mv^2}{1/2\times 1.5m\times (\dfrac{2}{3}v )^2}=\dfrac{mv^2}{1.5m\dfrac{4}{6}v^2 }=1:1

8 0
2 years ago
Is it true or false that wave interference only occurs with transverse waves?
Mama L [17]
I am not 100% sure but i think it is true.
7 0
2 years ago
1. All of the following show friction as a useful force, except _____.
Slav-nsk [51]
1. H<span>aving to push a rough and heavy box across the floor to move it.
2. </span><span>The coefficient of sliding friction will decrease.
3. G</span>reater than <span>the friction involved in rolling an object.
4. D</span><span>rag.
5. S</span>liding (kinetic) friction. Sliding friction<span> is also known as </span>kinetic friction - force that is needed to keep a surface sliding<span> along another surface.</span>
7 0
3 years ago
Read 2 more answers
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