brooke

Is there anyway you can turn off that little vibration or sound when you talk into your microphone on the keyboard? 

like if you use your microphone to ask safari a question..& then you press it again because you are done it makes a little sound & i need that off? 

At Niagara Falls, if 505 kg of water falls a distance of 50 m, what is the increase in the internal energy of the water at the bottom of the falls? Assume that all the initial potential energy goes into increasing the waters internal energy and that the final kinetic energy is zero. 

answer?

Liquid nitrogen is used to cool substances to very low temperatures. Express the boiling point of liquid nitrogen(77.34 K) in degrees Celsius AND in degrees Fahrenheit.

Temp= C

Temp= F

oxygen condenses into a liquid at approximately 90.2 K. To what temperature does this correspond on both the Celsius AND Fahrenheit temperature scales? 

Temp= C

Temp= F

what would happen if you removed 1.25 x 10^7 J of energy from my 5 kg sample of steam at 120 C? what phase would it be in? What temperature would it be at?

phase?

A 1.5 x 10^4 kg car moving at 17 m/s to the north collides with and sticks to another railroad car of the same mass that is moving in the opposite direction at 5.5 m/s. What is the velocity of the joined cars after the collision? 

velocity? 

A .4 kg ball approaches a wall at 15 m/s. It collides with the wall and rebounds with an actual speed in the opposite direction. Calculate the impulse exerted on the wall 

impulse- 

A .15 kg marble sliding to the right at .225 m/s on a frictionless surface makes an elastic head-on collision with a .25 kg marble moving to the left at .18 m/s. After the collision, the first marble moves to the left at .12 m/s. Find the velocity of the second marble after collision 

velocity-

A 1200 kg car is moving right at 7 m/s has a head-on collision with a 2200 kg truck moving left at 8 m/s. If the velocity of the car after the collision is 2 m/s to the left, what is the velocity of the truck after the collision if they bounce off each other? 

velocity? 

The largest meteorite of lunar Origin reportedly has a mass 19 g. if the meteor right placed on a scale her spring constant is 83 N/m, what is the compression of the spring?

weight-

compression (x)=

hey simple pendulum has a frequency of 0.032 Hz. What is its length?

period-

length-

calculate the period of a pendulum that is 1.42 m long. What is this pendulum’s frequency?

period-

frequency- 

in amusement park ride swings back-and-forth 4 times per minute. What is the period of the ride?

frequency- 

period-

A 15 kg spring oscillates 32 times each minute. Find the: 

frequency-

period-

spring constant of the spring- 

A 12 V storage battery is conducted to three resistors, 6.75, 15.3, and 21.6 ohms, respectively. The resistors are joined in series. Calculate the equivalent resistance. Find the current in the circuit. Also find the voltage drop at each resistor. Draw a schematic diagram of the circuit.

RT = ____________

IT = _____________

V1 = ____________

V2 = ____________

V3 = ____________