94 Answered Questions for the topic mass

23d

#### Physics Question- Momentum and Impulse

A 52 kg girl rides on a 2.6 kg skateboard. The girl on the skateboard moves at 1.3 m/s. If the girl jumps off the skateboard backwards with a velocity of 1.6 m/s, how fast does the skateboard roll... more

11/07/19

10/04/19

#### What is the mass in grams

What is the mass in grams of 4.2 moles of water ?

09/14/19

#### Chem: when mass changes

Explain what it means for mass to change.

09/11/19

#### Chem: change in mass

Explain what it means to have a change in mass.

09/11/19

#### Chem: change in mass

Explain what it means to have a change in mass.

09/09/19

#### Chemistry Indiana Jones HMWK

A quantity of sand has a mass of 1200g and a volume of 750cm^3. What is the density of sand?Correct Answer: 1.6 g/cm^3 (which I got) the part I’m confused on is as follows......The volumes of sand... more

09/09/19

#### A Density Question for Chemistry

A gold statue has a volume of about 1.5L. How many cm^3 is thismy answer: 1,500cm^3 = rounded to 1 significant figure is (2,000cm^3)apparently its wrong but I don’t know how^^^This then leads to... more

08/19/19

05/12/19

#### Mass Of 3 pineapples and 2 apples is 11.4 kg. Total mass of 2 pineapples and 4 apples is 8.4 kg. Find the mass of 1 pineapple and 1 apple.

Help needed as this is creating problem for my kid.

04/13/19

#### Are Newton's "laws" of motion laws or definitions of force and mass?

If you consider [them](http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion) as laws, then there must be independent definitions of [force](http://en.wikipedia.org/wiki/Force) and... more

03/28/19

#### What is the maximum mass of the precipitate formed when 127 mL of 2.1 M potassium phosphate reacts with magnesium chloride?

2 K_3PO_4 (aq) + 3 MgCl_2 (aq) = Mg_3(PO_4)_2 (s) + 6 KCl (aq)

02/27/19

#### How many grams of nitrogen are there in a sample of nitrogen that contains 4.0 moles of nitrogen atoms?

Plz help this is due tomorrow and I keep getting stuck on this problem !!!

02/22/19

#### What mass of O_2 gas must be produced in order for 4.5 L of NaOH to react completely at STP?

According that H_2O reacts with Na_2O_2 according to the following equation:2Na_2O_2 + 2H_2O yields 4NaOH + 1O_2

09/14/18

#### How does the mass of an object affect the outcome when an unbalanced force acts on it?

How does the mass of an object affect the outcome when an unbalanced force acts on it?

08/21/18

#### [Math] Finding density of the object

Approximate the volume of each object whose mass is given. Then find the mass per unit of volume, or density, of each object.   The problem is, I don't know where to... more

06/03/18

#### How to find the weight of the air inside a ball?

I know the radius including the outside layer or "shell" of the basketball is 0.1205m and without is 0.1075m. The inflation pressure is 55158.06 N/m2 in Pascals.

03/20/18

#### Mass of Aspirin in a tablet

In a lab determining the mass of acetylsalicylic acid in an aspirin tablet, I'm having trouble with the dilution part of my calculation.   An unknown solution was made by placing an aspirin... more

01/30/18

#### Calculate the Partial pressure of each gas at STP, and calculate the density at STP.

At STP, air can be considered to be a mixture of ideal gases: 21.1% O<sub>2</sub>, 78.0% N<sub>2</sub> and 1.00% Ar by volume.   a) Calculate the partial pressure of each... more

01/27/18

#### What is the mass in grams of a cube of gold (density = 19.32g/cm3) if the length of the cube is 2.00cm?

What is the equation set up?

01/16/18

#### what is the momentum of a system of two particles

What is the momentum of a system of two particles with these respective masses and velocities: 3.75 kg moving north at 5.6m/s and 4.2 kg moving northwest at 2.3m/s?

01/15/18

#### What is the radius of the circle?

A car is turning on a circular path with a constant speed of 7 m/s. If the car mass is 1200 kg and the coefficient of static friction is between the cars tires and the road .68 what is the radius... more

12/06/17

#### Can someone help me with Mole Conversion?

I'm struggling to understand on how to do this, I'm currently trying to use dimensional analysis to solve the problems, please help.   1. What is the mass of 12.5 moles of silicon?   2. How... more

11/18/17

#### Find the acceleration of the books:

A Student moves a box of books with a rope by pulling the rope with a force of 90 N at an angle of 30°.   The books have a mass of 20 kg and a coefficient of friction between the box and floor is... more

11/15/17

#### what is the empirical formula?

the compound xylene consists of 90.49% C and the rest is hydrogen.What is the empirical formula?

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