# Posts by Rashida

Total # Posts: 24

**algebra**

The difference between two numbers is 108 less than their sum.If the larger number is twice the smaller number,find the difference between the two numbers.

**maths**

Age of Rahul's father is 3 times Rahul's age now.After 15 years he will be twice the age of Rahul. Find their present age.

**Physical Science**

A 73.0 g silver spoon at 19.2 c is place in a cup of coffee at 91.2 c. How much heat does the spoon absorb from the coffee to reach a temperature of 85.6 c?

**Physical Science**

A 1600.0 kg car with a speed of 75.0 km/h brakes to a stop. How many cal of heat are generated by the brakes as a result?

**Physical Science**

An 84.9 kg man is standing on a frictionless ice surface when he throws a 2.00 kg book at 11.1 m/s. With what velocity does the man move across the ice?

**Physical Science**

What is the weight of a 4.82 kg backpack in Newton and the acceleration of the backpack if a net force of 10.0 N is applied in m/s2?

**Physical Science**

Does wood float in gasoline?

**Physical Science**

Write the number represented by 0.9^1900 with both 5 and 1 significant figures.

**physicsal science**

Write the number represented by 0.9^19 with both 5 and 1 significant figures.

**Physical Science**

If student A measures a laptop computer to be 37.2 cm long, and student B measures 36.7 cm, what is the percentage error?

**Phsical Science**

Other than familiarity, what is the advantage of the English System of measurement?

**Physical Science**

The standard unit of length in the metric system is based on what.

**Physical Science**

A loaf of bread (volume 3200 cm3) with a density of 0.50 g/cm3 is crushed in the bottom of the grocery bag into a volume of 2400 cm3. What is the density of the mashed bread in g/cm3

**Astronomy**

Why are there multiple lenses cemented together to form the objective lens and the eyepiece lens?

**Physics**

What would our seasons be like if the rotation of the Earth's was aligned with the plane of the ecliptic so that the north pole pointed directly at the Sun once per year.

**Science**

Is planet X a Large asteroid?

**Astronomy**

Why is it possible to see the planet Mercury at 6:45 pm on February 5, 2014.

**Astronmy**

How far in degrees will Mercury suppose to be from the Sun on February 5, 2014 and how did you determine it?

**Physics**

The peak wavelength and observed color of a 50,000 K star is 58nm and too blue to see with the human eye. True or False.

**physics**

A hydrogen atom in an excited state emits a Balmer beta photon followed by a Lyman alpha photon. The electron decayed from the third excited state to the first excited state to the ground state. True or False.

**statistics**

Imagine that the probability of answering this question correctly is only p = .4, and on tests in which it is used, only 8 people attempt it. On what proportion of such tests will fewer than 3 people answer the question correctly?

**Statistics**

Imagine that the probability of answering this question correctly is only p = .4, and on tests in which it is used, only 8 people attempt it. On what proportion of such tests will fewer than 3 people answer the question correctly?

**Math**

Sam measured the out side of his vegetable garden.The sides measured 6 feet, 3feet, 6feet, and 3 feet.How much fencing does sam need to put a fence around the whole garden?Show two different methods of finding the solution.

**math**

The amounts of oil pumped from an oil well in each of the years 2001 to 2004 formed a geometric progression with common ratio 0.9. The amount pumped in 2001 was 100000 barrels. Calculate in which year the amount pumped will fall below 5000. The amounts of oil pumped from an ...