Nilan

the kilowatt-hour is a unit of: force, work, power, or time?

14 years ago

a bullet with a mass of 5 g and a speed of 600 m/s penetrates a tree to a depth of 4 cm. Assume that a constant frictional force stops the bullet. Calculate the magnitude of this frictional force. *Also, I'm not sure if the answer would be positive or neg...

14 years ago

a bullet with a mass of 5 g and a speed of 600 m/s penetrates a tree to a depth of 4 cm. Assume that a constant frictional force stops the bullet. Calculate the magnitude of this frictional force. I used KE = 1/2 mv^2 = 900 J then F (friction ) = W/d = 22...

14 years ago

If an auto weighing 13,345 N causes a bridge to sag 0.0254 m, a truck weighing 26,690 N would cause the bridge to sag how many meters, assuming the truck was on the same spot as the auto had been? How do I even set this up?

14 years ago

If an ammeter records 8 amperes and a voltmeter records 1.1 volts, the resistance of the conductor in the circuit is ___ ohms

14 years ago

what current will flow through a resistance of 11 ohms when the emf impressed acrosss the resistance is 2.8 volts?

14 years ago

Resistors of 30 ohms and 60 ohms are connected in parallel and joined in series to a 10 ohm resistor. The circuit voltage is 180 volts. Find: the voltage of the parallel circuit the voltage across the parallel circuit the current through the 10 ohm resist...

14 years ago

Produce a third degree polynomial that has exactly the roots -3 and 5 with y-intercept 1350. I understand I could start with (x+3)(x-5)^2, but i don't know how to get the y-intercept 1350 with the same conditions. Please help. thank you.

14 years ago

Use the equation y = ax^2 + bx + c where x is the horizontal distance a baseball has traveled and y is the height of the ball at the given distance. 1)Are some values of y unreasonable? 2)How is this information important for choosing a window for the gra...

14 years ago

height of a projectile thrown straight up from top of 480 ft hill t seconds after bing thrown up with initial velocity vo ft/s is h = -16t^2 +vot + 480 If vo = 96, find times when the projectile will be at a) height of 592 ft above the ground and b) crash...

14 years ago

Find all positive solutions to: x^6 + 7x = 4x^4 - x^2 + 8

14 years ago

If log (base b) 3 = 1.099 and log (base b) 6 = 1.792, find log (base b) 18 = ???

13 years ago

Let N(t) be number of bacteria after t days. N(t) = Pa^t for some constants P and a. N(2) = 5400 and N(6)=382,000. a)before working problem, estimate value of N(5). b) write down 2 equations for P and a, one when t=2 and one when t=6, and use these two eq...

13 years ago

My question is how do I know that N increases by a factor of 2.9 each day. (see below) Let N(t) be number of bacteria after t days. N(t) = Pa^t for some constants P and a. N(2) = 5400 and N(6)=382,000. a)before working problem, estimate value of N(5). b)...

13 years ago

Two forces, F1 and F2, act on the 5.00 kg block shown in the drawing. The magnitudes of the forces are F1 = 69.0 N and F2 = 24.5 N. What is the horizontal acceleration (magnitude and direction) of the block? F1 is pointing at the top left corner of the bo...

13 years ago

In 9.7 s a fisherman winds 2.1 m of fishing line onto a reel whose radius is 30 cm (assumed to be constant as an approximation). The line is reeled in at constant speed. Determine the angular speed of the reel in rad/s. Thank you.

13 years ago

Assume the earth is a uniform sphere and that its path around the sun is curcular. Calculate the kinetic energy that the earth has because of its rotation about its own axis. For comparison, the total energy used in the US in one year is about 9.33 x 10^9...

13 years ago

Estimate the gallons of paint needed to cover the outside of a cylindrical silo which is 30 feet in diameter and 70 feet high. Do not include any roof area. The paint covers approximately 150 square feet/gallon.

13 years ago

What is the rotational speed (rpm) of the 64 in diameter rear tires of a tractor traveling at 6.5 mph if there is no slippage? How do I work this? Thank you.

13 years ago

The dissolved Ca++ concentration in a river is approximately 30 mg/L. This concentration is equivalent to ___ ppm or ___ mol/L, or ___ cmol/L. It would provide ___ cmolc+/L. (c+ is a subscript)

12 years ago

So F = 22500 Am I right in thinking it is POSITIVE?

14 years ago

Thank you

14 years ago

I won't have access to this on a test. How can I work it on a calculator.

14 years ago

Force 1 is pushing on the top left corner of the box. The arrow forms a 65 degree angle with the verticle (as if the box were extended straight left, from 9:00 to the arrow = 65 degrees) I found F1 horizontal component to be 69 cos 65 = 29.16 N F2 is push...

13 years ago

I'm still confused. to find angular speed = tnngenital speed/radius, would the radii cancel out, leaving only the tangential speed? still confused as to set up

13 years ago

I forgot to mention that I got 6.417E29 for part A and 2.688E34 for part B. Both answers were wrong. Please help. Thank you.

13 years ago

how do you convert mg to moles?

12 years ago