Friday
December 13, 2013

# Posts by olga

Total # Posts: 67

physics
Your new designer chair has an S-shaped tubular metal frame that behaves just like a spring. When your friend, who weighs 580 N, sits on the chair, it bends downward 5 cm. What is the spring constant for this chair?

statistics
For a sample with a mean of M 45, a score of 59 corresponds to z 2.00. What is the sample standard deviation?

Chemistry
Can someone explain to me in simple terms what is relative mass and absolute mass? And how to calculate them too. Thanks.

physics
A tricycle releases 60 J of gravitational potential energy while rolling 0.59 m directly downhill along a ramp. What is the downhill force (if constant) acting on the tricycle?

physics
If you sit in a good swivel chair with your feet off the floor, the chair will turn slightly as you move about but will immediately stop moving when you do. Why can’t you make the chair spin without touching something?

physics
Your car is broken, so you’re pushing it. If your car has a mass of 868 kg, how much momentum does it have when it’s moving forward at 4.74 m/s (17.1 km/h)?

Chemistry
Some solid copper(II) sulfate is dissolved in sufficient water to make 100.0 mL of solution. Enough of a sodium hydroxide solution of concentration 0.1500 mol/L is added just to react with all of the first solution, with none left over. This turns out to be a volume of 47.08 m...

physics
Some special vehicles have spinning disks (flywheels) to store energy while they roll downhill. They use that stored energy to lift themselves uphill later on. Their flywheels have relatively small rotational masses but spin at enormous angular speeds. How would a flywheel...

physics
When your car is moving at 3.33 m/s and car has a mass of 860 kg, how much translational kinetic energy does it have?

math
lyle needs 200g of chocolate that is 86% cocoa for a cake recipe he has one kind that is 99% cocoa and another kind that is 70% cocoa. How much of each kind does he need to make the cake

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