admin

A.meter ,sound

B.candela,mole

C.kilogram,ampere

D.meter,killogram

2 months ago

Guest #9847744

2 months ago

Choice D - meter is a the unit of measure for length and kilogram is for mass.

Guest #9847745

2 months ago

D meter,kilogram

is the

right

choice...

Buona fortuna amici!!!

Question

Which one describes how much matter an object contains,using SI units?

A.43kg

B.65m

C.38pounds

D.89second

A.43kg

B.65m

C.38pounds

D.89second

Solution 1

Mass is how much matter an object contains and it is measured in kilograms, so choice A is correct: 43 kg.

Solution 2

**Answer:**

choice A

**Explanation:**

Question

can the body have acceleration with zero velocity?give reason

Solution 1

No body object or point can have a constant velocity if there is a change in velocity aka acceleration.

We know that the derivative of velocity is equal to acceleration.

This means that if you take the derivative of any constant velocity : 2mph, 5mph, 85mph, etc, you will always get the value zero for acceleration. This includes the constant zero as well. In this example we would take the derivative of zero which is zero.

Comprendes?

We know that the derivative of velocity is equal to acceleration.

This means that if you take the derivative of any constant velocity : 2mph, 5mph, 85mph, etc, you will always get the value zero for acceleration. This includes the constant zero as well. In this example we would take the derivative of zero which is zero.

Comprendes?

Question

What is the meaning of lightyear?

Solution 1

"Lightyear" is a *distance* ... specifically, the distance that light travels

through vacuum in one year of 365 days.

It's equivalent toÂ 9.454 x 10^12 kilometers, orÂ 5.875 x 10^12 miles .Â

through vacuum in one year of 365 days.

It's equivalent toÂ 9.454 x 10^12 kilometers, orÂ 5.875 x 10^12 miles .Â

Question

Â Â Our understanding of the atom has changed over time. Which idea that was once accepted is now considered scientifically inaccurate?Â A. The nucleus is the center of the atom. Â B. An atom is solid material. Â C. Electrons have a negative charge. Â D. Electrons are arranged in layers.

Solution 1

my sis just took the test the answer is

B.) An atom is solid material.

or An atom is a solid sphere.

Solution 2

**The correct answer to the question is : B) An atom is a solid material.**

**EXPLANATION:**

From Rutherford's alpha ray scattering experiment, we know that most of the spaces in an atom is empty.

It is so because most of the alpha particles in that scattering experiment had gone undeviated without any deflection by the positively charged nucleus.

**Hence, atom can not be considered as a compact solid sphere.**

Question

Â Â Consider a bathtub filled with water, with a plug in the drain.Â How longÂ would this be considered a closed system?Â A. a few seconds Â B. 2 hours Â C. 10 hours Â D. 1â€“2 days

Solution 1

Is this a trick question?

*Â . . a closed system doesn't exchange any matter with its surroundings and isn't subject to any external force, it is essentially an isolated system.*

In the case of a bathtub,*it is *__open immediately __*to evaporation*, so the truth is this system is *never *closed

*the correct answer is E.) none of the above*

In the case of a bathtub,

Solution 2

**Answer:**

The answer is a few seconds since it is closed but the water drains after 3-5 seconds.

**Explanation:**

I took the test. BAM!

Question

What is the defining feature of a system?Â A. properties that donâ€™t changeÂ B. collision Â C. interaction Â D. gravitational force

Solution 1

Â . . so the answer is

Question

why a steel ship becomes magnetized as it is constructed?

Solution 1

Question

What can be absorbed or released as the result of a chemical reaction?

Solution 1

energy is released or absorbed ,but no loss in total molecules,each of which consists of one atom of oxygen and two of hydrogen,are broken down.!

Solution 2

Chemical reaction involves absorption or release of heat energy.

Question

This is science

A girl cycles for 3hrs at a speed of 40km/h --what distance did she travel

A girl cycles for 3hrs at a speed of 40km/h --what distance did she travel

Solution 1

(40 km/hr) x (3 hr) = 120 km .

Question

when we touch a steel rod and a paper simultaneously we feel that the rod is comparatively colder .why?

Solution 1

it is so because the steel is more colder than our body.

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