Friday

December 19, 2014

December 19, 2014

Number of results: 29,189

**Physics**

In a design for a piece of medical apparatus, you need a material that is easily compressed when a pressure is applied to it. Would this material have a large bulk modulus, small bulk modulus, or is the bulk modulus not relevant to this situation?
*November 13, 2007 by Marie*

**Geology**

How is a mid-latitude cyclone formed: thunderstorms on the west side of an occluded front, frontal systems in association with the Jet Stream, a lot of hot air, or cyclonic circulation around a sub-tropical high? (Straight forward answers, if possible use the answer choices ...
*October 2, 2011 by Rachel*

**Enviro Science**

28. Good experiments have 2 key characteristics; they are a. an experimental group and a confirmed hypothesis b. analysis of the control group and an accurate prediction of the outcome c. conducting the actual experiment and reporting the results d. testing a single variable ...
*April 25, 2012 by mysterychicken*

**physics**

A 4100 kg helicopter accelerates upward at 2.44 m/s^2. The acceleration of gravity is 9.8 m/s^2. What lift force is exerted by the air on the propellars? Answer in N. I wasnt sure which way to approach this problem, so i tried it two different ways: A. 2.44(4100)= 10,004 N or ...
*July 2, 2011 by alexa*

**Physics**

A bicyclist is coasting down a road that is sloped downward at an angle of 8. The bicycle and bicyclist have a total mass of 80 kg. If the bicycle wheels roll freely, without any effect from friction or air resistance slowing the motion, how fast would the bicyclist accelerate?
*November 3, 2011 by Pat*

**College Physics - Speed**

Traveling at a speed of 15.6 m/s, the driver of an automobile suddenly locks the wheels by slamming on the brakes. The coefficient of kinetic friction between the tires and the road is 0.730. What is the speed of the automobile after 1.25 s have elapsed? Ignore the effects of ...
*March 14, 2012 by Anonymous*

**physics**

Fairgoers ride a Ferris wheel with a radius of 5.50 m, the bottom of which is 1.75 m above the ground. The wheel completes one revolution every 32.0 s. If a rider accidentally drops a stuffed animal at the top of the wheel, where does it land relative to the base of the ride...
*September 26, 2012 by Kabe*

**Physic**

A 61-kg skier, coasting down a hill that is an angle of 23 to the horizontal, experiences a force of kinetic friction of magnitude 72N. The skier's speed is 3.5m/s near the top of the slope. Determine the speed after the skier has travelled 62m downhill. Air resistance is ...
*August 14, 2013 by Tristan*

**Physics**

A car of mass 900.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 49.7 km/hr (13.8 m/s), the net power which the engine supplies is 4300.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate ...
*January 2, 2014 by Sam*

**Physics**

A car of mass 900.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 49.7 km/hr (13.8 m/s), the net power which the engine supplies is 4300.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate ...
*January 2, 2014 by Adam*

**physics**

Level I: If a rider accidentally releases an object when the ride is at maximum height and top speed, how far away (horizontally) would that object land, assuming negligible air resistance? If viewed from above, what would the path of that object look like?
*May 5, 2014 by Anonymous*

**Algebra**

A Coast Guard plane has enough fuel to fly for 6hr, and it's speed in still air is 240 mph. The plane departs with 40 mph tailwind and returns to the same airport flying into the wind. How far can the plane travel under these conditions?
*May 24, 2014 by Kgk*

**Physics**

A helicopter is ascending vertically with a speed of 5.66m/s. At a height of 106m above the Earth, a package is dropped from the helicopter. How much time does it take the package the package to reach the ground? (Ignore air resistance) I would like to know what my givens are ...
*September 8, 2014 by Taylor*

**Algebra**

The velocity of a ball thrown in the air is 72ft Per second. The height of the ball after t seconds Is represented by the equation H = 72ft t - 62t^2. Describe the dependent variable, the domain and range. Honestly I have to say I am lost 72 + 72ft - 256 = ? 72 + 184t =0
*October 12, 2014 by Sue*

**physics**

Jordan throws a golfball straight up from the top of a building 50 meters high. The initial speed of the golfball is 20 m/s and it just misses the edge of the roof when it eventually falls. Neglecting air resistance, find the velocity of the golfball just at the instant it ...
*October 12, 2014 by Ellie*

**Health (Ms. Sue)**

When is CPR used? A: CPR is used when a person does not have a pulse or a blood pressure and are not responsive. CPR is also used when a person is in cardiac arrest?
*January 1, 2014 by Anonymous*

**Physics- really fun!**

okay so i lied, it's not fun, sorry. pressure gradient-why can't submarines go to the bottem of the ocean? Thank you for using the Jiskha Homework Help Forum. but posting so close together with the SAME question is considered "flooding." It is worth reposting if you have ...
*May 7, 2007 by Georgia*

**geo/science**

could you please tell me if schist is a sedimentary rock or metamorphic. Is it formed by high temperature and high pressure. I have to draw a sketch of schist would you be able to suggest a web page that shows a sketch Yes it is metamorphic.
*April 20, 2007 by Bex*

**CONTEMPORARY ISSUES IN AMERICAN EDUCATION**

Standards-based education can sometimes put pressure on teachers to be sure they measure up to state standards. How does teacher accountability have a positive influence on the classroom environment? How does it have a negative influence?
*December 14, 2007 by mike*

**Chemistry**

What happens to these physical properties as the strength of intermolecular forces increases? My answers are there as well but its not correct Increase or decrease? a) melting point - increases b) vapor pressure-increases c) boiling point- increases d) viscosity - decreases e...
*May 11, 2009 by Saira*

**chemistry **

A large cylinder of helium had a small hole through which the helium escaped ata rate of 0.0064 mol/hr. How long would it take for 0.010 mol of CO to leak through a similar hole if it were at the same pressure?
*May 1, 2010 by Amy *

**physics**

Blood of density 1010kg/m^3 that is to be administered to a patient is raised about 1.51 m higher than the level of the patient's arm. How much greater is the pressure of the blood than it would be if the container were at the same level of the arm? The acceleration of gravity...
*October 26, 2010 by Ashleigh*

**Physics**

A collapsible plastic bag contains a glucose solution. If the average gauge pressure in the vein is 1.21 103 Pa, what must be the minimum height h of the bag in order to infuse glucose into the vein? Assume the specific gravity of the solution is 1.03.
*November 7, 2012 by Amelia*

**chemistry**

H2(g) + Cl2(g) HCl(g) Consider the unbalanced equation above. 3.95 L of H2 and 1.00 L of Cl2 are reacted under the same conditions of temperature and pressure. (a) How many liters of HCl will be produced? (b) How many liters of reactant are in excess? i found part a to be 2.00...
*October 20, 2014 by olivia*

**Physics **

A cylinder with a piston is filled with ideal gas. The gas temperature is held at 450 K. The cylinder is heated by an oven through a square metal rod connected between the oven and the cylinder. The rod has sides d = 2 cm and length L = 2.3 m. (a) If the oven is held at 850 K...
*November 12, 2010 by Need Help*

**physics**

if hydrogen and chlorine react to form hydrogen what would be the volume of HCL that is formed if 60m cubed of hydrogen is completely used up in the reaction?
*October 5, 2009 by khanyi*

**Physiology**

Pure gold has a density of 19 g/ml. If you bought a gold ring and found it had a volume of 0.3 ml and it weighed 5.7 grams, is it real gold? Show me your calculation
*January 27, 2011 by Jerome*

**science**

a sample of natural gas at stp is 78% ch4 and 22% c2h6 by volume. how many moles of each gas are presented in 2 L of the mixture.assume ideal gas behavior
*February 20, 2011 by uriel*

**Chemistry**

A liquid hydrocarbon (Cx Hy) is found to be 16.37% H by mass. A 1.158-g vaporized sample of the hydrocarbon has a 358 mL volume at 71.0 C and 749 mmHg. what is the molecular formula for this hydrocarbon?
*June 21, 2011 by Katrina*

**math**

Write an expression for the volume of a rectangular prism if the length is 5 feet shorter than some x amount, the width is 3 feet longer than x, and the height is x feet.
*March 1, 2012 by josh*

**calculus**

The region bounded by the curve y=1(1+2x) , the line X=2 , the x-axis and the y axis is rotated completely about the y-axis. Show that the volume generated is 1/2π(4-ln5)
*May 27, 2012 by fairuz*

**Chemistry Science**

A sample of the element ygfjygg m has a mass of 5.6 g +/- .1 g and a volume of 3.1 cm3 +/- .5 cm3. The true density of Lindeminium is 1.92 g/cm3. ----HOW TO CALCULATE RANDOM ERROR(18%)?---
*May 29, 2012 by science girl*

**MATH- CHECK**

BUYING A WEDDING RING- AREA? BUYING DIRT FOR S POTTED PLANT- VOLUME? BUYING PAINT FOR BEDROOM CEILING- PERMETER?
*June 6, 2012 by Celest*

**calculus**

Let V be the volume of the 3-dimensional structure bounded by the paraboloid z=1−x^2−y^2, planes x=0, y=0 and z=0 and by the cylinder x^2+y^2−x=0. If V=aπ/b, where a and b are coprime positive integers, what is the value of a+b?
*March 12, 2013 by Saksham*

**chemistry**

A student finds a rock on the way to school. In the laboratory he determines that the volume of the rock is 29.7 cm3, and the mass in 139.943 g. What is the density of the rock?
*January 16, 2014 by Anonymous*

**geometry**

The volume of a cylinder is 980 in.4072-07-02-02-00_files/i0220001.jpg. The height of the cylinder is 20 in. What is the radius of the cylinder? Express your answer to the nearest hundredth.
*July 13, 2014 by Corey*

**Physics**

The engine of a 1-kg toy plane exerts a 15-N forward force. If the air exerts an 8-N resistive force on the plane, what is the magnitude of the acceleration of the plane?
*January 7, 2012 by Sharon*

**please correct grammer in my paragraph**

The critics of power plants are right: The amount of radiation power plants release is dangerous. However, people dont realize that they are constantly exposed to radiation by various ways. One can get exposed to radiation of 350 millirems from just standing in the sun for a ...
*November 1, 2007 by julie*

**Grammar and Composition**

the draft sheet is organized in a confusing way, here's how i filled it: 1. Broad Subject: Phonebook Names 2. Limited Topic for Thesis Statement: John E. Mackintosh 3. Main Idea about This Topic (how do you feel about this topic) (what is your opinion about this topic or issue...
*November 3, 2009 by y912f*

**ochem**

Calculate the amount (volume) of 5.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 100 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.
*January 29, 2009 by steve*

**chemistry**

Calculate the amount (volume) of 5.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 100mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.
*February 2, 2009 by Jane*

**chemistry**

Calculate the amount (volume) of 6.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 150 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation
*January 31, 2010 by Fann*

**CHEMISTRY- molality**

what volume of hydrochloric acid of density 1.18g cm3 and containing35.0% by mass must be allowed to react with zinc in order to liberate 6.36g H2 gas? can you tell me the steps. i get so confused with this topic.
*October 13, 2010 by lulu*

**physics**

If 250 moles of gas are compressed to 0.75 of an original volume at a constant temperature or 295 K, how much heat must have gone into the environment? Answer a. 176 kJ. b. 205 kJ. c. 112 kJ. d. 122 kJ.
*October 15, 2010 by jim*

**Chemistry**

Calculate the amount (volume) of 6.25% (wt./vol.) NaOCl solution (commercial bleach) required to oxidize 150 mg of 9-fluorenol to 9-fluorenone. Whenever appropriate, use balanced chemical equations as a part of your calculation.
*February 1, 2011 by Shannon*

**Chemistry**

what volume of ammonia gas will be produced when 8.01 L of hydrogen react completely in the following equation. N2 + 3H2 > 2NH3 this stuff is so confusing because one little word seems to change the entire process for solving.
*April 17, 2012 by Randy*

**math**

in a rectangular with a perimeter of 30 inches two parallel and equally spaced creases are made the cardboard is then folded to make a triangular prism with open ends that are equilateral triangles you will maximize the volume how do i solve this?
*October 18, 2012 by nicole*

**chem word problem **

.A gas at 72 C occupies 10 L. What is the temperature in Kelvin when it expands to a volume of 22 L? Round to the nearest whole number and don't forget the units. is it charles or boyles law? my answer cam out to be 6.7k but i know its wrong
*May 23, 2013 by billy*

**Engineering**

Determine the minimimum depth of a water reservoir that will provide a flow rate of 1200 gpm in a 4 inch diameter horizontal pipe that opens to the atmosphere You ought to consider Bernoulli's equation for this, it is in your text. You can model it as this: A drop of water at ...
*September 10, 2006 by matt*

**Physical science**

In my tenth-grade-level physical science class, we're studying heat, and I completely don't get it. I'll read the definition for specific heat over and over, and I still don't understand it. "For all substances, specific heat is a characteristic physical property, which is ...
*October 18, 2007 by Devon*

**physics**

Suppose that the displacement of a particle is related to time according to the expression delta x = ct^3. What are the SI units of the proportionality constant c? My answer: delta x = ct^3 m = c s^3 (s: seconds) m/s^3= c The SI units for c: m/s^3 correct? 2) Determine if ...
*January 15, 2007 by galileo*

**lab procedures**

After reconstitution with 1.5 ml diluent, a 500 mg vial of ceftazidime injection yeilds an approximate volume of 1.8 ml.Each ml contains approximately 280 mg.If 500 mg IM are ordered, how many ml should be administered?
*September 13, 2007 by GENE*

**Physical Science**

The radius of a certain planet is 6.04x10^7 meters, and its mass is 5.19x10^26 kg. Find the density of this planet. (The volume of a sphere is given by (4/3)(pie)(r^3). Answer in units of grams/cm^3
*February 3, 2008 by Christina*

**Science**

A class made models of a graduated cylinder using plastic cups. Describe how your team can test the accuracy of these models for measuring volume. List the steps in your procedure.
*April 21, 2008 by Nicole*

**Science**

A class made models of a graduated cylinder using plastic cups. Describe how your team can test the accuracy of these models for measuring volume. List the steps in your procedure.
*April 21, 2008 by Nicole*

**URGENTTT!!**

I need to use the scalar triple product. but i dont have any vectors? how am i supposed to know what the vectors all coming from one corner are?? Q:Calculate the volume of the parallelepiped with vertices at: (9,4,3), (7,12,2), (12,5,6), (3,-4,0), (10,13,5), (1,4,-1), (4,5,2) ...
*September 6, 2008 by jess*

**URGENTTT!!**

I need to use the scalar triple product. but i dont have any vectors? how am i supposed to know what the vectors all coming from one corner are?? Q:Calculate the volume of the parallelepiped with vertices at: (9,4,3), (7,12,2), (12,5,6), (3,-4,0), (10,13,5), (1,4,-1), (4,5,2) ...
*September 6, 2008 by jess*

**chemistry**

What volume of .101 M HNO3 is required to neutralize each of the following solutions? there are four and i got them all right but this one... 51.1 mL of .127 M NH3 i got 193 mL can someone please help???
*March 10, 2009 by lyne*

**college chem**

how many mL of .100 M of acetic acid and .100 M of NaOH, would be need to make the volume 1.0 liters and have a pH7.00 if Ka=1.8x10^-5? can someone please help me with steps to get the answer
*March 24, 2010 by josh*

**physi**

a slab of ice floats on a freshwater lake what is the minimum volume must the slab have for a 45kg women to be able to stand on it without getting her feet wet?
*July 20, 2010 by paul*

**calculus**

Suppose that the radius r of a right circular cone of fixed height h = 20 cm is increasing at a rate 4 cm/s. How fast is the volume increasing when r = 10? Give your answer correct to two decimal places.
*October 11, 2010 by John*

**Calculas**

Suppose that the radius r of a right circular cone of fixed height h = 30 cm is increasing at a rate 10 cm/s. How fast is the volume increasing when r = 15? Give your answer correct to two decimal places.
*October 12, 2010 by Jp*

**physics**

A full can of black cherry soda has a mass of 0.406 kg. It contains 3.38 10-4 m3 of liquid. Assuming that the soda has the same density as water, find the volume of aluminum used to make the can.
*December 4, 2010 by amanda*

**physics**

A full can of black cherry soda has a mass of 0.406 kg. It contains 3.38 m3 of liquid. Assuming that the soda has the same density as water, find the volume of aluminum used to make the can.
*December 6, 2010 by joe*

**statistics**

3. You obtain the following regression statistics for the relationship between defect rate and volume at one of your plants. You have a random sample of results from 160 shifts at the plant.
*January 1, 2011 by john*

**math**

a right triangle whose hypotenuse is h mm long is rotated about one of its legs to generate a circular cone.find the radius and altitude of the cone of greatest volume.
*February 14, 2011 by gen*

**Chemistry**

If 10.0 grams of sodium bicarbonate reacts with 50.0mL of 2M acetic acid, what is the limiting reactant? what reactant is in excess, and by how much? What volume of carbon dioxide gas would form?
*March 10, 2011 by Alexandra*

**chemistry**

Consider the reaction: CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l) ΔH = - 890.3 kJ What volume of CH4(g) at 25C and 755 Torr will produce 88600 kJ of heat when reacted with excess oxygen?
*March 21, 2011 by Kamila*

**Chemistry**

2. A eudiometer contains 45 ml of oxygen when the barometer reading is 731.7 mm and the temperature is 27* C . The water level inside the tube is 68mm higher than that outside . What volume does the dry oxygen occupy at S.T.P?
*June 19, 2011 by Noodle*

**Chemistry**

If 17.14 grams of nitric acid are reacted with a large amount of aluminum metal, what volume of of hydrogen gas would be produced at STP? What would be the balanced equation for this problem?
*July 13, 2011 by Bradley*

**CALCULUS help please**

The radius of a right circular cylinder is given by t + 9 and its height is (1/9)*(t^0.5) where t is time in seconds and the dimensions are in inches. Find the rate of change of the volume with respect to time. units = in^3/s
*October 24, 2011 by Karishma*

**chemistry**

to what volume should you dilute 125mL of an 8.00M CuCl2 solution so that 50.0mL of the diluted solution contains 5.9g KNO3 I have a hard time determing the M1V1=M2V2 is
*November 6, 2011 by swtnblk*

**chemistry**

A mixture of 8.95 g of Cl2 and 18.0 g of NO2 and an undetermined amount of SO2 occupies a volume of 22.4 liters at 760 mm Hg and 0 C. How many moles of SO2 are present? I keep coming up with 62 and that is not right. Someone please help!!
*March 29, 2012 by marie*

**chemistry**

dry gaseous hcl contained in volume of 1L at STP is dissolved in 200ml of 0.5M barium hydroxide soltion. How many mol of 0.5M hcl would be needed to neutralise the resulting solution?
*April 2, 2012 by mob*

**chemistry**

A volume of 40.0 of aqueous potassium hydroxide was titrated against a standard solution of sulfuric acid h2so4. What was the molarity of the solution if 20.02 of 1.50M h2s04 was needed? Who helps me to solve it for me.
*July 31, 2012 by Fai*

**SCIENCE**

Unit of measure for the international system of measurement-what unit is used for temperature, mass, volume, and length? please answer :) I NEED TO STUDY AND HAVE A QUIZ TOMORROW
*September 9, 2012 by DESPERATE*

**Chemistry**

HC8H4O4K + NaOH = H2O + H4C8O4KNa I'm given the volume of NaOH in mL (ex: 9.11 mL), and I have to convert it to moles. How can I do that conversion? Please help by explaining if you can, I've had trouble with this problem for the whole week..
*October 7, 2012 by Karen*

**thermodynamics and kinetics**

One mole of an ideal gas undergoes an isothermal reversible expansion, doing 1 kJ of work and doubling the volume. What is its final temperature? How much heat was added to the gas?
*October 12, 2012 by Dorota*

**College Chemistry**

What volume of the solution in 5a would be necessary to react completely with 23.00mL of 0.549M NH3 according to the equation: NiSO4+6NH3 -> [Ni(NH3)6]SO4 The molarity of ta is 1.667 x 10^-4M
*October 25, 2012 by Bill*

**Chemistry 3A**

in a lab experiment, 133mL of gas was collected over water at 24 degrees Celsius and 742 torr. Calculate the volume that the dry gas would occupy at STP.
*December 4, 2012 by Gurjot *

**Chemistry**

27) What volume of benzene (C6H6, d= 0.88 g/mL, molar mass = 78.11 g/mol) is required to produce 1.5 x 103 kJ of heat according to the following reaction? 2 C6H6(l) + 15 O2(g) 12 CO2(g) + 6 H2O(g) Hrxn = -6278 kJ
*December 8, 2012 by Jennifer*

**Calculus**

a swimming pool has the shape of the ellipse given by (x^2)/3600 + (y^2)/1600 = 1 The cross sections perpendicular to the ground and parallel to the y-axis are squares. Find the total volume of the pool.
*January 29, 2013 by Mike*

**MATH HELP: Volumes of Pyramids and Cones**

This is my last question in Math. :p 9. Find the volume of a rectangular prism with the following dimensions: Length = 5 mm Base = 7 mm Height = 3 mm a. 142 mm^3 b. 105 mm^3 c. 126 mm^3 d. 130 mm^3
*February 19, 2013 by Batman*

**calc **

the base of s is a elliptical region with boudary cuvrve 16x^2 +16y^2 =4. cross sections perpandicular to the x axis are isosceles right triangles with hypotenuse in the base. find the volume of s
*February 19, 2013 by mike*

**geomerty**

A manufacturer made a container that looked like the Washington Monument to fill with raisins, as shown. Find the volume of the container the base is 2 in and 2 in the height is 5 in then the triagle is 2 in. There is a line between the h 5 and the 2
*May 27, 2013 by Hannah*

**phy**

A slab of ice floats on a freshwater lake. What minimum volume must the slab have for a 50.0kg woman to be able to stand on it without getting her feet wet?
*November 29, 2013 by shree*

**Chemistry**

When a student doesn't polish a sample of Mg ribbon before massing it, what happens when calculating the molar volume? Is it that the Mg ribbon doesn't completely react therefore less volumes of gas are produced?
*January 15, 2014 by K*

**analytical chemistry**

What volume (in liters) of 0.96 M KOH solution should be added to a 0.130 L solution containing 10.2 g of glutamic acid hydrochloride (Glu, FW=183.59; pKa1=2.23, pKa2 =4.42, pKa3=9.95) to get to pH 9.90?
*March 27, 2014 by joi*

**GEOMETRY !**

***Sorry i forgot to add the actual question The Great Pyramid at Giza has a sqaure base with sides of length 230 meters and a height of 146.7 meters What is the volume
*April 27, 2014 by PLEASE HELP*

**Math (Calculus)**

Use the disc method to find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the indicated line. y=x^3, y=0, x=2 a)the x-axis b)the line x=4
*May 9, 2014 by Sherman*

**Calculus**

Find the volume of the solid obtained by rotating the region bounded by the curves: y = x^2 and x = y^2 about the line y = 1. I received the answer pi/30, using the outer radius of (1 - x^2) and the inner radius of (1 - x^(1/2)). Is this correct?
*November 23, 2014 by Joshua*

**Chem**

In an automobile engine, at the end of the upstroke the piston is at its maximum height in a cylinder of exact dimensions. At this time, a precisely measured mixture of fuel and oxidant ignites to form gaseous products. If the ignition temperature is known, how could you ...
*October 26, 2010 by Kay*

**College Physics II (Calc-Based)**

In state-of-the-art vacuum systems, pressures as low as 1.00 x 10^-9 Pa are being attained. Calculate the number of molecules in a 1.90-m^3 vessel at this pressure and a temperature of 35.0C. Okay. So I know I have to use the Ideal Gas Law, PV = nRT, I then transformed it ...
*August 29, 2013 by Andrew*

**physics**

A large crate filled with physics laboratory equipment must be moved up an incline onto a truck. 1. The crate is at rest on the incline. What can you say about the force of friction acting on the crate? 2.A physicist attempts to push the crate up the incline. The physicist ...
*February 1, 2011 by madaline*

**Physics Problem**

A 60 kg skydiver moving at terminal speed falls 50m in 1 s. What power is the skydiver expending on the air? This what I got so far: powerloss=weight * velocity powerloss=60kg *50m powerloss=3000 (but I dont know the units)
*September 25, 2007 by Jenni*

**Physics**

292 kg motorcycle is accelerating up a ramp that is 30 degrees above the horizontal. Propulsion force pushing the motorcycle up ramp is 3150 N. Air resistance produces a force of 250 N that opposes the motion. Find that motorcycle's acceleration.
*October 5, 2009 by Jenn*

**Physics**

A dynamite blast sends a piece of rock (shatter) straight upwards. After 2.31x10^0 s the piece of rock has a velocity of 1.56x10^1 m/s. Assuming there is no air resistance, what is the initial velocity of the rock, to two significant figures?
*October 14, 2010 by peter*

**Calculus**

The rate of change R, in kilometers per hour, of the altitude of a hot air balloon is given by R(t)=t^3-4t^2+6 for time on the interval [0,4], where t is measured in hours. Assume the balloon is on ground level. What is the maximum altitude of the balloon during the interval [...
*January 10, 2011 by Joe Schmo*

**Physics**

In her physics lab, Stephanie rolls a 30 g marble down a ramp and off a table with a horizontal velocity of 2 m/s. The marble falls in a cup placed 0.4 m from the table’s edge. a. How long is the ball in the air? 0.2 s b. How high is the table? m
*February 27, 2012 by Sam*

**Physics**

a) While painting a 12 meter high roof you knock the paint brush off the edge, with no air resistance on the brush how long will it take to hit the ground? b) What would the velocity of the brush be before it hit the ground?
*May 31, 2012 by Anonymous*

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