Thursday

July 24, 2014

July 24, 2014

Total # Posts: 26

**Science**

calculate the ratio of the area to the volume for a unit cube a unit sphere inscribed inside the cube and a right cylinder incribed inside the cube

**physics**

You launch a model rocket up into the sky. Right after launch the rocket is accelerating upwards at 10 m/s2. What is the magnitude of the net force in Newtons on the rocket if the rocket has a mass of 0.1 kg?

**calculus**

integrate the following (3y-7x-3)dx+(7y-3x-7)dy=0

**calculus**

integrate it by integrating factor (cos^3x)dy/dx +ycosx=sinx

**calculus**

solve it by integating factor dy/dx + (x+1/x)y=e^-2x

**Statistics**

3.The lifespan of 300 Giant turtles is found to follow a Normal distribution ~ N(70,144). (a)What is the standard error for this sample’s mean? (b) What is the probability of a turtle living more than 85 years? (c)What is the probability of a turtle living between 60 and ...

**Statistics**

A study shows that the probability of a baby being born with gene x is 0.6. The probability of a baby being born with gene y is 0.7. (a)What is the probability of being born with both genes assuming that the probabilities are independent? (b)In fact; 90% of those born with gen...

**Statistics **

The turnover (in millions of pounds) for 8 train companies and 8 coach companies are given below. Train 4.3 13.2 134 88 92 66.5 122.1 102 Coach 2.2 31 44 72 19 89.3 55.9 43.1 (a)Using an appropriate statistical test determine whether train companies or coach companies have hig...

**physics**

A pendulum of length L = 48.5 cm and mass m = 169 g is released from rest when the cord makes an angle of 65.4 with the vertical. What is the speed (m/s) of the mass upon reaching its lowest point?

**physics**

A pendulum of length L = 20.8cm and mass m = 168 g is released from rest when the cord makes an angle of 65.2 with the vertical. (a) How far (m) does the mass fall before reaching its lowest point? (b) How much work (J) is done by gravity as it falls to its lowest point? ...

**physics**

The loaded car of a roller coaster has mass M = 320 kg. It goes over the hig a speed v of 21.4 m/s. The radius of curvature R of the hill is 62.3m (a) What is the force (N) that the track must exert on the car? (positive is (b) What must be the force (N) that the car exerts on...

**physics**

Block M = 7.50 kg is initially moving up the incline and is increasing speed with a = 3.82 m/s2 . The applied force F is horizontal. The coecients of friction between the block and incline are s = 0.443 and k = 0.312. The angle of the incline is 25.0 degrees. (a...

**physics**

To test your friend's claims about his car, you accept his oer of a ride about campus. Not wanting to exceed the speed limit, he claims he can only give a taste of the accelerating ability of his car and not the full proof. You notice, however, that the pine tree scen...

**physics**

A 34.2 -kg block rests on the oor. (a) What force (N) does the oor exert on the block? (b) If a rope is tied to the block and run vertically over a pulley, and the other end is attached to a free-hanging 5.6 kg weight, what force (N) does the oor now exert on the block? (c) If...

**physics**

A block starts from rest at the top of a 2.00-m long, 16.3 -degree frictionless incline. (a) What is the acceleration (m/s2 ) of the block? (b) How fast (m/s) is it going at the bottom?

**physics**

Lance arrives early at the airport (with owers and balloons in hand) to welcome a friend. Her plane is delayed. While waiting, he notices that it takes 2 minutes 47 seconds to get down the hall on the moving sidewalk. While walking (not on the moving sidewalk), it took him 110...

**Physics**

A ball on the end of a string is moving in circular motion as a conical pendulum as in the figure. The length L of the string is 1.70 m, the angle is 37.0 degrees and the ball completes one revolution every 2.51 seconds. (a) What is the speed (m/s) of the ball? (b) What ...

**Physics**

A particular Ferris wheel (a rigid wheel rotating in a vertical plane about a horizontal axis) at a local carnival has a radius of 20.0 m and it completes 1 revolution in 9.84 seconds. (a) What is the speed (m/s) of a point on the edge of the wheel? Using the coordinate system...

**Physics**

A place kicker must kick the football from a point 34.2 m from the goal and clear a bar 3.00 m above the ground. The ball leaves the ground with a speed of 20.0 m/s at an angle of 53.0 degrees above the horizontal. (a) By how much (m) does the ball clear (positive value) or fa...

**physics**

During a snowball ght, your opponent distracts you by throwing a snowball at you with a high arc. She throws snowballs with a speed of 26.5 m/s and the first is thrown at 70.0 degrees. As you are watching the first snowball, she throws a second at a lower angle. (a) If both sn...

**physics**

A glass is slid across a table top, goes of the edge and falls to the floor below. The table is 0.860 m high and the glass lands 1.77 m from the edge. (a) With what velocity (m/s) did the glass leave the table top? (b) What was the direction of the glass's velocity (degree...

**physics**

A particular Ferris wheel (a rigid wheel rotating in a vertical plane about a horizontal axis) at a local carnival has a radius of 20.0 m and it completes 1 revolution in 9.84 seconds. (a) What is the speed (m/s) of a point on the edge of the wheel? Using the coordinate system...

**physics**

A bucket of mass M = [05] kg is attached to a second bucket of mass m = 3:52 kg by an ideal string. The string is hung over an ideal pulley as shown in the gure. Mass M is started with an initial downward speed of 2.13 m/s. What then is the speed (m/s) of mass M after it has m...

**Physics**

A drowsy cat spots a flower pot that sails first up and then down past an open window. The pot is in view for a total of 0.50s. And the top to bottom height of the window is 2.00m. How high above the window top does the flower pot go?

**Physics**

Thanks for the reply. But, i dont quite get where do u get X2 equation from.

**Physics**

When a high speed passenger train travelling at 161km/h rounds a bend,the engineer is shocked to see that a locomtive has improperly entered onto track from a siding and is a distance D=676m ahead.The locomotive is moving at 29km/h. The engineer of the high speed train immedia...

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