Thursday

July 24, 2014

July 24, 2014

Total # Posts: 22

**Physics**

The graph below shows the force applied to a 4.0 kg cart initially at rest but free to move on a horizontal track. Forces (in N) are measured on the ordinate and times (in s) are measured on the abscissa. Use the following values for the graph: a = 4.9 and x = 2.0. Assume the ...

**Calculus**

For what values of x is the graph of y=x e^{-4 x} concave down?

**Math**

find the points on x^2+y^2=11 where the tangent line has slope 11/60

**Calculus 1**

Find all the points on the ellipse 3x^2-xy+y^2=64 that lie on the line y=3x

**Physics**

A 2.1 kg pendulum bob hangs from a 2 meter string. It is pulled to the side, position A, so that the bob is 79 cm (h on the sketch) above the lowest position, position C. The bob is released and begins to swing. See below.

**physics**

A skier of mass 77.7 kg, starting from rest, slides down a slope at an angle $\theta$ of 35.7° with the horizontal. The coefficient of kinetic friction is 0.08. What is the net work, i.e. net gain in kinetic energy, (in J) done on the skier in the first 10.9 s of descent?

**Calculus**

Given f''(x)= -4sin(2x) and f'(0)=4 and f(0) =-6. Find f(pi/2)

**Physics**

A 20.5 N weight is held in the outstretched hand of a person with a shoulder-to-elbow length of 30.0 cm and an elbow-to-wrist length of 24.0 cm. The center of the weight is 5.5 cm from the person's wrist. Determine the magnitude of the torque about the elbow produced by th...

**Physics**

thank you very much!, really appreciate it!

**Physics**

Four point masses are arranged on the xy plane as follows. Mass1 = 47.0 grams at x = 2.00 cm and y = 2.00 cm. Mass2 = 55.0 grams at x = 0.00 cm and y = 4.00 cm. Mass3 = 27.0 grams at x = -3.00 cm and y = -3.00 cm. Mass4 = 45.0 grams at x = -1.00 cm and y = 2.00 cm. What is the...

**Physics**

yea i had the answer but forgot the negative, thanks man! really appreciate it!

**Physics**

yea i had the answer but forgot the negative, thanks man! really appreciate it!

**Physics**

A potter’s wheel of radius 53.13 cm and mass 106.4 kg is freely rotating at 47.1 rev/min. The potter can stop the wheel in 5.65 s by pressing a wet rag against the rim and exerting a radially inward force of 66.2 N. What is the angular acceleration of the wheel?

**Physics**

A 33.7 kg block m1 is on a horizontal surface, connected to a 7.10 kg block m2 by a massless string as shown in the Figure. The pulley is massless and frictionless.

**Physics**

A crate of mass 43 kg is loaded onto the back of a flatbed truck. The coefficient of static friction between the box and the truck bed is 0.47. What is the maximum acceleration a (in m/s2) the truck can have without the crate sliding off?

**Physics**

Two masses M1 = 6.10 kg and M2 = 3.90 kg are on a frictionless surface, attached by a thin string. A force of 47.7 N pulls on M2 at an angle of 29.5° from the horizontal as shown in the figure. Calculate the tension T in the string.

**Physics**

A 149 kg crate is pushed at constant speed up a frictionless inclined plane of theta = 51 with the horizontal. Assuming one pushes with a horizontal force, what is the magnitude of the force F (in N) required to do this?

**Physics**

A 149 kg crate is pushed at constant speed up a frictionless inclined plane of $\theta$ = 51 $^{\circ}$ with the horizontal. Assuming one pushes with a horizontal force, what is the magnitude of the force F (in N) required to do this?

**Physics**

You plan to throw stones by using a sling of length 0.6 m which you whirl over your head. Suppose you wish to throw a stone a distance of 32 m. What must be the centripetal acceleration of the stone just before its release if it is to reach this distance? Assume that the relea...

**PRACTICAL ENGLISH**

In a short story, any pronoun that indicates a person or thing spoken of is given in the _______ person.

**PRACTICAL ENGLISH**

In the following sentence, identify the part of speech of the italicized word. Large fish swim swiftly in the sea. A. Pronoun B. Adjective C. Noun D. Adverb

**writing sentences and paragraphs**

Which one of the following words is an antonym of joyful? A. Morose B. Garrulous C. Agitated D. Passive

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