10/31/23

A mass of 0.4 kg hangs motionless from a vertical spring whose length is 0.93m
A mass of 0.4 kg hangs motionless from a vertical spring whose length is 0.93m and whose unstreched length is 0.53m. Next the mass is pulled own to where the spring has a length of 1.05m given an... more
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10/31/23

NASA launches a rocket at t=0 seconds. Its height, in meters above sea-level, as a function of time is given by ℎ(t)=-4.9^2+268t+311.
NASA launches a rocket at t=0 seconds. Its height, in meters above sea-level, as a function of time is given by ℎ(t)=-4.9^2+268t+311. For each of the answers below, put your numerical answer,... more
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10/30/23

Hydraulic wheel cylinder

In an automotive brake wheel cylinder with a diameter of 1" and a center fill port with a piston on each end, and a line pressure of 100 psi, do the pistons force total 200 lbs of force or is it... more
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02/09/23

Dimensional analysis
The amount of fresh water on earth is estimated to be 3.73x108km3. There are 1000L in a cubic meter. How many 20,000 gallon backyard swimming looks can you fill up with this volume of freshwater?... more
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02/09/23

A gas has a pressure of 2.67 atm and occupies a volume of 6.8 L. If the gas is compressed to a volume of 1.2 L, what will its pressure be, assuming constant temperature? Answer in units of atm.
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02/08/23

Given the following equation: 8 Fe + S8 ---> 8 FeS 6. How many moles of iron are needed to react with 16.0 moles of sulfur?

need help
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02/05/22

A bicycle tire pump has a piston with area 0.40 in2. If a person exerts a force of 26 lb on the piston while inflating a tire, what pressure does this produce on the air in the pump?
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05/11/21

Calculate the pH of a 100 mL solution of 0.15 M NH3, given the Ka of NH4+ is 5.8 x 10-10. (1 pt)
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03/19/21

Two objects gravitationally attract with a force of 22N. If the distance between the objects is quadrupled (x4), then the new force of attraction is...?
Please explain how you found the answer and show work
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03/10/21

How much energy is required to raise the temperature of 12.4 grams of gaseous nitrogen from 20.1 °C to 39.2 °C ?
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03/09/21

A 43.0 kg parachutist is moving straight downward with a speed of 4.00 m/s .

If the parachutist comes to rest with constant acceleration over a distance of 0.785  , what force does the ground exert on her?
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02/18/21

chemistry homework

In a 74.0-g  aqueous solution of methanol, CH4O, the mole fraction of methanol is 0.160. What is the mass of each component?Mass of CH4O (g) ? Mass of water (g) ?
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02/15/21

While rearranging a dorm room, a student does 334 J of work in moving a desk 2.1 m. What was the magnitude of the applied horizontal force? N
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02/15/21

What is the potential energy of a 3.15-kg object at the bottom of a well 11.8 m deep as measured from ground level? J Explain the sign of the answer.
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02/15/21

Trigonometric function
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02/12/21

Chemistry Help Please!
If .2784 moles of aluminum sulfide react with fluorine, to make aluminum fluoride and elemental sulfur (S), how many moles of fluorine are used up?
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02/11/21

Calculate decelerate in m/s^2
Sam was driving with a speed of 45 miles per hour until a dog runs in front of him and suddenly he hits the brakes to decelerate his speed rapidly to 15 mph in 30s. Calculate his deceleration in... more
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02/11/21

How do I solve for Work using only distance?
Currently taking highschool physics when I came across this question in my homework:"A basketball player is lifting weights. She benches 45 kg, moving it 0.5 meters. If she does this in 0.8... more
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02/11/21

What is the percent yield of ZnCl2 when 18.0 g of Zn reacts with excess HCl and 29.3 g ZnCl2 is produced?
Zn + 2HCl = ZnCl2 + H2
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02/11/21

For the reaction 3KOH+H3PO4⟶K3PO4+3H2O how many grams of potassium phosphate, K3PO4, are produced from 63.3 g of potassium hydroxide, KOH?
Answer looks like mass of potassium phosphate: g
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02/11/21

How many US Senators are there?
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02/11/21

Earth and Space science

Fill in the two processes that cause each of the following transitions. Ocean -> Cloud _______________________, _______________________Cloud -> Glacier _______________________,... more
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02/05/21

Which of the following would be a restriction of the second amendment to the us constitution?
A. A ban on school smoking in public B. Schools as gun-free zonesC. Handicapped parking spaces D. Emergency evacuation routes
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09/21/20

The order is for 25mg. The bottle says 100mg per 15ml of liquid. How many milliliters should you get?

The doctor finally figures out what is wrong with you and prescribes a medicine that will return you to full health. The order is for 25mg of the medicine. The nurse walks in with a liquid and you... more
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09/21/20

Kinetics in Physics

An Olympic diver is on a diving platform 7.70 m above the water. To start her dive, she runs off of the platform with a speed of 1.19 m/s in the horizontal direction. What is the diver's speed, in... more
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