# Posts by Brownie

Total # Posts: 20

**Math**

A satellite which travels around the earth has a power supply that provides power according to the formula: P = 17200/t + 100 where t is the number of days the satellite is aloft. Find the rate at which power is decreasing after 380 days. rate in watts/day (enter as a positive...

*January 29, 2013*

**Math**

Find the rate of change of the area of a circle when its radius is 18.0 m and the radius is changing at the rate of 10.1 cm/s? rate in m2/s = My attempt.... dA/ dt = Pie R^2 * dr/dt 10.1cm/s = pie (1800cm) * dr/dt dr/dt = 0.0101/pie 3240 * m^3/m^2 dr/dt = 0.0101/pie 3240 m2/s ...

*January 29, 2013*

**Math**

For a track and field athlete who can jump vertically, his distance above the ground is given by the formula s = 3.3t - 4.9t2. What is his initial velocity? velocity in m/s = My Answer S'= 3.3-9.8t S'(0) = 3.3 velocity in m/s = 3.3 Can you please confirm this answer ...

*January 29, 2013*

**Math**

A car is projected directly up an incline and its location from its start point is given by the formula s = 9t - 5t2. Determine its initial velocity and initial acceleration. initial velocity in m/s = initial acceleration in m/s2 = My Answer s'=9-10t initial velocity in m/...

*January 29, 2013*

**Math**

An atomic particle moves in a linear motion according to the formula s = 19 - 14t2 + 4t3. Determine the particle's velocity at the end of 2.9 seconds. velocity in m/s = My Answer S'= 0-28t+12t^2 S'(2.9) = 0-28(2.9)+12( 2.9)^2 = 0-81.2+100.92 =19.72 Can you please ...

*January 29, 2013*

**Math**

A particle moves in a linear motion according to: s = 10 - 6t2. Find the acceleration of the particle at t = 4s. acceleration in m/s2 = My Answer s'= 0-12t s"= -12 acceleration in m/s2 = -12

*January 29, 2013*

**Math**

A particle is projected along an inclined plane with a velocity given by the formula v = 4.4t2 + 10.1t -23.2. Determine the acceleration of the particle when t = 1.5 s. acceleration in m/s2 = My Answer V'=8.8t+10.1 V"=8.8 V"(1.5)= 8.8 acceleration in m/s2 = 8.8 ...

*January 29, 2013*

**Math - check answer**

Given v = 2t3 + 87t2 - 636, determine the acceleration for t= 1 s. acceleration in m/s2 = My Answer v'= 6t^2+174t V"= 12t V"(1) = 12 acceleration in m/s2 = 12 Can you please confirm this is correct.. Thanks!

*January 29, 2013*

**Math - check answer**

Given v = 4t - 9t3, find the acceleration when t = 1 s. acceleration in m/s2 = My Answer V'=4-27t2 V"= -54t V"(1)= -54 acceleration in m/s2 = positive 54 Can you please confirm this is correct???? Thanks

*January 29, 2013*

**Math - check answer**

Bella, did you post this answer in the wrong question????

*January 29, 2013*

**Math - check answer**

A rifle bullet is fired directly upward from the ground. Its height above the ground at any instant of time t is given by the formula, s = 63t - 9.8t2. Assuming there is no air resistance how high will the bullet rise? height in meters = My Answer S'= 63-19t s"=0-19.6...

*January 29, 2013*

**Math - check answer**

Given s = 10 - 10t2 + 45t3, determine the velocity when t = 1 s. velocity in m/s = My Answer S'= 0-20t + 135t^2 S'(1) = -20+135 = 115 velocity in m/s = 115 Can you please confirm this is correct. Thanks!

*January 29, 2013*

**Math - check answer**

Given s = 4t + 11t3, find the velocity when t = 1 s. velocity in m/s = My Answer: S'=4+33t^2 =4+33 =4+33 =37 velocity in m/s = 37 Can you please confirm this is correct. Thank you

*January 29, 2013*

**Motion Problems**

A satellite which travels around the earth has a power supply that provides power according to the formula: P =(17200)/(t + 100) where t is the number of days the satellite is aloft. Find the rate at which power is decreasing after 380 days. rate in watts/day (enter as a ...

*January 29, 2013*

**ALGEBRIA 2**

X x 4 (X) + 5 X = -2

*September 11, 2011*

**ALGEBRIA 2**

CLARIFYING MY QUESTION SHOULD BE: X x 4 (X) + 5

*September 11, 2011*

**ALGEBRIA 2**

QUESTION IS: X X 4(x) +5 WHEN X = -2

*September 11, 2011*

**bobpursley**

Thank You,very much

*February 29, 2008*

**Physics**

You're explaining to a youngster at the seashore why the water is cyan colored. The youngster points to the whitecaps of overturning waves and asks why they are white. What is your answer?

*February 29, 2008*

**Physics**

Does light travel faster through the lower atmosphere or through the upper atmosphere?

*February 29, 2008*

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