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3 years ago

A substance made up of 2 or more elements is called

Physics

2 answers:

Nina [5.8K]3 years ago

8 0

Answer:

A compound

Explanation:

2 or more elements mean its a compound

Andrew [12]3 years ago

3 0

Answer; a compound

Explanation; Compounds are made up of 2 or more elements bonded together by forces of attraction e.g ionic bonds, metallic bond, covalent bonds.

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You stand on a spring scale on the floor of an elevator. Of the following, the scale shows the highest reading when the elevator

Virty [35]

Answer:

move upward with increasing speed

I draw fbd diagram , see in figure

when lift going upward -

F - mg = ma

f = m( a + g)

scale so highest reading

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4 years ago

Which statement about the mass and the weight of an object is correct?

Fantom [35]

Answer:

HOPE IT HEPLED U !!!!

Explanation:

i think it's (C) They have different units ....

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3 years ago

G = 10 N/kg or 10 m/s2

Irina18 [472]

Answer:

a) $U_{g} = 40\,J$ , b) $\eta = 70\,\%$ , c) $v = 20\,\frac{m}{s}$

Explanation:

a) The initial potential energy is:

$U_{g} = (0.2\,kg)\cdot \left(10\,\frac{m}{s^{2}} \right)\cdot (20\,m)$

$U_{g} = 40\,J$

b) The efficiency of the bounce is:

$\eta = \left(\frac{14\,m}{20\,m} \right)\times 100\,\%$

$\eta = 70\,\%$

c) The final speed of Danielle right before reaching the bottom of the hill is determined from the Principle of Energy Conservation:

$K = U_{g}$

$U_{g} = \frac{1}{2}\cdot m \cdot v^{2}$

$v = \sqrt{\frac{2\cdot U_{g}}{m} }$

$v = \sqrt{\frac{2\cdot (40\,J)}{0.2\,kg} }$

$v = 20\,\frac{m}{s}$

5 0

3 years ago

Inessa05 [86]

Savings account is where she can have access to her money anytime in case of an emergency.

<h3>What is a Savings account?</h3>

This is a type of account run by a financial institution which yields interests on deposits made.

This type of account usually comes with features in which the money can be withdrawn via an ATM card or by visiting the bank to collect it. This therefore makes it the most appropriate choice for Analisa.

Read more about Savings account here brainly.com/question/25787382

7 0

3 years ago

A 140 g air-track glider is attached to a spring. The glider is pushed in 8.2 cm against the spring, then released. A student wi

max2010maxim [7]

Answer:

Explanation:

The period of oscillation is given as

T=2π√m/k

Making k subject of the formula

Square both sides of the equation

T²=4π²(m/k)

Cross multiply

T²k=4π²m

Then, divide through by T²

k=4π²m/T²

Where

k is spring constant

m is the mass of the bob

And T is the period of the oscillation

m=140g=0.14kg

14 oscillations takes 14 seconds

Then the period is

T=time/oscillation

T=14/14

T=1sec

Then,

k=4π²m/T²

k=4π²×0.14/1²

k=1.76N/m

Then, the spring constant is 1.76N/m

4 0

4 years ago