04/19/21

Physics Question
Jenny (mass = 63 kg) is skiing down a 17° slope. A tailwind is assisting her as she travels down the slow with a force of 18 N (parallel to the slope). The coefficient of dynamic friction between... more
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04/19/21

Are my answers to these Chemistry problems correct?
For the following questions, use the following: Tungsten metal is manufactured by the reaction of Tungsten Trioxide (WO3) with Hydrogen (H2). Water is a byproduct of this reaction.*What is the... more
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04/19/21

What is the maximum mass of S8 that can be produced by combining 80.0 g of each reactant? 8SO2+16H2S⟶3S8+16H2O
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04/19/21

If 33 moles of MnO2 combine with 40 moles of Al, how many moles of Mn can form? What is the limiting reagent? 3MnO2(s)+4Al(s)⟶3Mn(s)+2Al2O3(s)
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04/19/21

Radioactive iodine-131 decays with a half-life of 8.0 days. A chemist obtains a fresh sample of iodine-131 and measures its radioactivity.

She then determines that to do an experiment, the radioactivity cannot fall below 25% of the initial measured value. How long does she have to perform the experiment?
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04/19/21

Please help thank you in advance
For the function whose values are given in the table below,  is approximated by a Reimann Sum using the value at the left endpoint value of each of three intervals with width... more
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04/19/21

Please help thank you in advance
A biker is slowing down according to the following table of velocities: Time (secs) 0 1 2 3 4 Velocity (feet/sec) 25 20 16 12 10 Approximate the distance traveled, in feet, during these 4... more
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04/17/21

6)Which of the following can create a magnetic field? a) Stationary positive charges b) Stationary negative charges c) moving charges (positive or negative) d) all of the above
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04/17/21

If our moon only had an angular dimeter of 1/16th of a degree, how many arcseconds would it subtend
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04/17/21

Help please I have no I deal what im doing
1. For the following UNBALANCED reaction what is the mole ratio of H,O to B(OH),?BO (+ HOB(OH),A. 3 H 0:2 B(OH),B. 2 H20 : 3 B(OH), C. 2 H,0:1 B(OH), D. 1 H,0:1 B(OH)2. Lead(II) sulfide, Pbs,... more
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04/16/21

The Bohr model predicted various properties of the hydrogen atom. Which of the following was NOT among them?

The Bohr model predicted various properties of the hydrogen atom. Which of the following was NOT among them? a) the electron orbited 52.9 pm from the nucleus b) only certain energy states were... more
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04/16/21

Consider the unbalanced equation: H2S(s) + O2(g)  SO2(g) + H2O(l)
a. If 178.0 g of H2S are mixed with 157.0 g O2 which reactant is limiting and what is the theoretical yield of sulfur dioxide (in grams)? b. How much of the excess reactant (in grams) remains? c.... more
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04/16/21

Consider the following balanced equation: C3H8(g) + 5O2(g)  3CO2(g) + 4H2O(l)
a. How many moles of C3H8 would react with 7.93 moles of oxygen? b. How many moles of H2O could be produced from 18.9 moles of C3H8? c. If 19.00 grams of O2 are mixed with excess C3H8 how many... more
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04/16/21

Which of the vectors are Orthogonal?
a = (1,2), b = (0,1), c = (−2,−4), u = (−2,1) , v = (2,4), w = (−6,3)
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04/16/21

Pre calculus 4.1
If angle ACB is 25 degrees and line AC is 4000 miles (the radius of the earth). Find the distance between points A and B.
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04/15/21

A plane flying horizontally at an altitude of 3 miles and a speed of 520 mi/h passes directly over a radar station. Find the rate at which the distance

A plane flying horizontally at an altitude of 3 miles and a speed of 520 mi/h passes directly over a radar station. Find the rate at which the distance from the plane to the station is increasing... more
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04/15/21

A ball weighing .05 kg strikes a 1000 kg stationary wall at 30 m/s. According to Newton's Third Law, which of these must be true?

A: The wall moves away from the ball at 30 m/s B: The total Momentum of the system before impact was 1.5 kg • m/s C: The total Momentum of the system before impact was 15 kg • m/s D: The total... more
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04/15/21

A green 6kg ball is moving at 4 m/s. It collides with an orange 4 kg ball that is not moving (v= 0m/s). After the collision the green ball stops moving (v= 0m/s).

What is the velocity of the orange ball after the collision? A: 6 m/s B: 4 m/s C: 0 m/s D: 8 m/s
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04/15/21

A 3.6 g sample of iron (III) oxide reacts with sufficient aluminum to be entirely used up. How much iron is produced?
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04/15/21

A gas has a volume of 2.8 L at a temperature of 27°C. What temperature in degrees celsius is needed to expand the volume to 15 L?
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04/15/21

calculate the volume(in liters) occupied by 42.56g of CO at 0.992 atm pressure and a temperature of 65 degrees Celsius
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04/15/21

Can you solve this showing each step

How many litres of Carbon dioxide are produced from 3.45 g of Carbon and excess oxygen at STAP?
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04/15/21

Al + Pb(No3)2 = Al(No3) + Pb 5.00 g sample of aluminum is mixed with a 50.0 g sample of lead (II) nitrate producing 17.12 g of lead. What are the theoretical and percent yields of lead.
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04/15/21

Aspirin, C9H8O4, is synthesized by the reaction of salicylic acid, C7H6O3, with acetic anhydride, C4H6O3
2C7H6O3 + C4H6O3 → 2C9H8O4 + H2OWhen 20.0 g of C7H6O3, and 20.0 g of C4H6O3 react, what is the limiting reactant? If 22.03 g of C9H8O4, are produced in the lab what is the percent yield?
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04/15/21

14) A 20Ω resistor is connected to a 5V battery. What current will flow in the circuit? a) 0.25A b) 4A c) 25A d) 100A
Show the calculations of the problem
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