Wednesday

December 2, 2015
**physics**

A dumbbell has a mass m on either end of a rod of length 2a. The center of the dumbbell is a distance r from the center of the Earth, and the dumbbell is aligned radially. If r≫a, the difference in the gravitational force exerted on the two masses by the Earth is ...
*Tuesday, December 1, 2015 by brooklyn*

**physics sound waves**

A friend in another city tells you that she has two organ pipes of different lengths, one open at both ends, the other open at one end only. In addition, she has determined that the beat frequency caused by the second-lowest frequency of each pipe is equal to the beat ...
*Tuesday, December 1, 2015 by brooklyn*

**Physics**

A 1000Kg car is traveling at 40 m/s. a.) if the car stops in 20 seconds, what is the deceleration rate? b.) what friction force will stop the car in 20 seconds?
*Tuesday, December 1, 2015 by Ellen *

**Physics**

A soccer player kicks the ball toward a goal that is 28.0 m in front of him. The ball leaves his foot at a speed of 19.5 m/s and an angle of 30.6° above the ground. Find the speed of the ball when the goalie catches it in front of the net. (Note: The answer is not 19.5 m/s...
*Tuesday, December 1, 2015 by Anonymous*

**Physics **

1) can the position-time graph for the motion of an object be a horizontal line?explain - so its yes? 2) can the positon-time graph bea vertical line, explain -so its yes
*Tuesday, December 1, 2015 by anonymous *

**Physics **

The position time-graph for the motion of a certain particle is a smooth curve, like a parabola.At a given instant of time the tangent line to t he position-time graph has a negative slope. is the instantaneous velocity of the particle at this time positive, negative, or zero?...
*Tuesday, December 1, 2015 by anonymous *

**Physics **

1) an objects position-time graph is a straight line with a positive slope. is the velocity of this object positive,negative or zero. negative 2) an objects position-time graph is a straight line with a negative slope. is the velocity of this object positive,negative or zero...
*Tuesday, December 1, 2015 by anonymous *

**PHYSICS**

The pressure and volume of an ideal monatomic gas change from A to B to C. From A to B, volume remains 0.400 and pressure rises to 4.00x10^5. From B to C, volume changes from 0.400 to 0.200 while pressure remains the same. There is a curved line between A and C and is an ...
*Tuesday, December 1, 2015 by Coffee*

**physics**

A projectile is fired at 30.0° above the horizontal. Its initial speed is equal to 172.5 m/s. Assume that the free-fall acceleration is constant throughout and that the effects of the air can be ignored. What is the maximum height reached by the projectile? At what time ...
*Tuesday, December 1, 2015 by Kevin*

**Physics**

A person who is 1.1 m tall throws a ball with a speed of 5.2 m/s at an angle of 56 degrees above the horizontal. What are the x and y components of the velocity (in m/s) of the ball the instant before it strikes the ground? The acceleration due to gravity is 10 m/s2
*Tuesday, December 1, 2015 by Kevin*

**Physics**

The launching speed of a certain projectile is 6.8 times the speed it has at its maximum height. Calculate the elevation angle at launching.
*Tuesday, December 1, 2015 by Kevin*

**Physics**

A catapult on a cliff launches a large round rock towards a ship on the ocean below. The rock leaves the catapult from a height H = 32.0 m above sea level, directed at an angle theta = 46.9° above the horizontal, and with a speed v = 29.6 m/s. Assuming that air friction ...
*Tuesday, December 1, 2015 by Kevin*

**physics **

A 65.5 kg high jumper leaves the ground with a vertical velocity of 8.1 m/s. How high can he jump? The acceleration of gravity is 9.8 m/s2 .
*Tuesday, December 1, 2015 by BROOKE *

**PHYSICS**

Two blocks of masses m1 = 4.5kg and m2 = 6.5kg resting on a frictionless area connected by light inextensible chord as shown. A horizontal force F of 33.0 N directed to the right is applied to m1 as shown. Find (A) acceleration and (B) tension of the chord?
*Tuesday, December 1, 2015 by Camz*

**algebra**

in a class of 30 students , there are 22 students who study chemistry but not physics, 4 who study physics but not chemistry and who study neighter chemistry nor physics. how many students in the class study physics
*Tuesday, December 1, 2015 by judith*

**physics**

to what height should a cylindrical vessel of diameter d be filled with a liquid so that due to force on the verticle surface of the vessel be equal to the force on the bottom
*Tuesday, December 1, 2015 by ash*

**physics**

A friend in another city tells you that she has two organ pipes of different lengths, one open at both ends, the other open at one end only. In addition, she has determined that the beat frequency caused by the second-lowest frequency of each pipe is equal to the beat ...
*Tuesday, December 1, 2015 by eva*

**physics**

A 0.014 kg bullet is fired straight up at a falling wooden block that has a mass of 4.0 kg. The bullet has a speed of 700 m/s when it strikes the block. The block originally was dropped from rest from the top of a building and had been falling for a time t when the collision ...
*Monday, November 30, 2015 by sarah*

**PHYSICS**

a girl walks 1km north in 15min.then walks 200m south west in 60sec.what is her average velocity?
*Monday, November 30, 2015 by bety*

**Physics**

How do you find final kinetic energy?
*Monday, November 30, 2015 by Rebecca*

**Physics**

A radioactive isotope of Bismuth undergoes Beta Decay with a half-life of 22 days. How long (in days) will it take the Activity (A) of the sample to decrease to one-ninth of its original value? Assume that the original activity is A0.
*Monday, November 30, 2015 by Ash*

**Physics**

In a car crash, Car A rear ends Car B that stopped at a red light. After the crash, Car A and Car B meld together moving at a speed of 14 m/s. Car A has a mass of 1750 kg. Car B has a mass of 2000 kg. Calculate the initial momentum of Car A. So far I have Va=? Ma= 1750 kg Vb=0...
*Monday, November 30, 2015 by Rebecca*

**Physics**

1. The problem statement, all variables and given/known data A 2.0-m measuring stick of mass 0.175 kg is resting on a table. A mass of 0.500 kg is attached to the stick at a distance of 74.0 cm from the center. Both the stick and the table surface are frictionless. The stick ...
*Monday, November 30, 2015 by Tyler*

**Physics**

At t = 0 s,a particle of mass 7.08 kg starts from rest at the origin and moves with a velocity v = 6.00t^2i(hat) − 6.00tj(hat) + 6.00k(hat) m/s. 1. What is the angular momentum of the particle at t = 0 s I know angular is calculated from moment of inertia * angular ...
*Monday, November 30, 2015 by Tyler*

**physics **

A box slides down a 30.0 degree ramp with an acceleration of 1.25m/s². Determine the coefficient of Kinetic friction between the box and the ramp. I'm not sure to work it out I draw a picture to see if it would help me but I'm still stuck..
*Monday, November 30, 2015 by Mindy *

**Physics 1100**

Find theta; and W in the figure below where w1 = 21.0 N, w2 = 34.0 N, and α = 64.0°, assuming that the arrangement is at rest.
*Monday, November 30, 2015 by Tess*

**physics**

A pitcher throws a 0.141-kg baseball toward the batter so that it crosses home plate horizontally and has a speed of 42 m/s just before it makes contact with the bat. The batter then hits the ball straight back at the pitcher with a speed of 50 m/s. Assume the ball travels ...
*Monday, November 30, 2015 by king*

**Physics Check my work please**

A mass is attached to a spring is 0.2 kg. The spring's constant is 40 N/m. The mass is stretched to a position of 0.3 m and released. The final position is 0.1 m. #1) Find the change in potential energy of the system. #2) What is the work done by the spring? #1) Change in ...
*Monday, November 30, 2015 by Jose Luis*

**Physics**

Using 3 - 4 complete sentences, explain the role of both types of transformers in getting electric energy from an electric power plant (coal-fired, natural gas or nuclear) to our homes.
*Monday, November 30, 2015 by Alisia*

**PHYSICS !!!**

The diffusion rate for a solute is 4.0 10-11 kg/s in a solvent-filled channel that has a cross-sectional area of 0.50 cm2 and a length of 0.220 cm. What would be the diffusion rate m/t in a channel with a cross-sectional area of 0.30 cm2 and a length of 0.10 cm?
*Monday, November 30, 2015 by myheadhurts*

**Physics**

Using 3 – 4 sentences, explain, in your own words, two ways you could cause an electrical current using only a wire and a horseshoe magnet.
*Monday, November 30, 2015 by Alex*

**Physics**

Five moles of an ideal gas are compressed isothermally from A to B, What is the work involved if the temperature of the gas is 332 K? Be sure to include the correct algebraic sign. GRAPH: wvw.webassign.n3t/cj8/15-fc-009.gif wvw and n3t need to be retyped in their proper form ...
*Monday, November 30, 2015 by Jordan*

**Physics Check My Work Please**

A mass is attached to a spring is 0.2 kg. The spring's constant is 40 N/m. The mass is stretched to a position of 0.3 m and released. The final position is 0.1 m. #1) Find the change in potential energy of the system. #2) What is the work done by the spring? #1) Change in ...
*Monday, November 30, 2015 by Jose Luis*

**PHYSICS**

A MAN RUNS 300M WEST IN 60SEC.THEN RUNS 100M NORTH-WEST IN 20SEC.WHAT IS IT'S AVERAGE VELOCITY IN M/S?
*Monday, November 30, 2015 by BETY*

**Physics ._.**

The diffusion constant for the alcohol ethanol in water is 1.24x10^-9 m2/s. A cylinder has a cross-sectional area of 4.10 cm^2 and a length of 2.06 cm. A difference in ethanol concentration of 1.37 kg/m^3 is maintained between the ends of the cylinder. In one hour, what mass ...
*Monday, November 30, 2015 by BlubBlub*

**physics**

A boat moving at 13 mi/hr is crossing a river in which the current flowing at 6 mi/hr.ln what direction should the boat head if it is to reach a point on other side of the river directly opposite its starting point. Please help me I really don't know what to do..
*Monday, November 30, 2015 by jae*

**Physics**

Assume the gas is diatomic, calculate how much heat was added to the gas in the process. One mole of ideal gas initially at a temperature of Ti=0 Celsius undergoes an expansion at a constant pressure of 1.00 atm four times its orginal volume
*Sunday, November 29, 2015 by Joseph*

**Physics**

A 0.60 kg mass is attached to a 0.6 m string and displaced at an angle of 15 degrees before it is released. 1)What is the potential energy of the pendulum? 2) What is the angular frequency of the pendulum? What is the height of its displacement? 4) What is the velocity of the ...
*Sunday, November 29, 2015 by Jose Luis*

**Physics**

Alex is exploring a cave that has a slight incline and is iced over, forcing her to use ice cleats to explore it. After climbing 50 m into the cave, she finds what she is looking for and she takes out her ice pick and hammer to begin removing the stones. Little does she know ...
*Sunday, November 29, 2015 by bri*

**physics**

The diffusion rate for a solute is 4.0E-11 kg/s in a solvent-filled channel that has a cross-sectional area of 0.50 cm^2 and a length of 0.220 cm. What would be the diffusion rate m/t in a channel with a cross-sectional area of 0.30 cm^2 and a length of 0.10 cm? m/t= ??E-11 kg...
*Sunday, November 29, 2015 by Alyna*

**physics**

Heat Q is added to a monatomic ideal gas at constant pressure. As a result, the gas does work W. Find the ratio Q/W. What in the world is this asking??
*Sunday, November 29, 2015 by Alyna*

**Physics**

order the acceleration from least to greatest. a) 30<-object ->50 b) 20<-object c) 20<-object->40 d) 10<-object->30 I think the answer is "dcba" but that isn't right
*Sunday, November 29, 2015 by Jacob*

**Physics**

A boat moving at 9.5 km/hr relative to the water is crossing a river 3.9 km wide in which the current is flowing at 4.9 km/hr. At what angle upstream should the boat head to reach a point on the other shore directly opposite the starting point? (Assume 0 degrees is straight ...
*Sunday, November 29, 2015 by Anonymous*

**Physics**

The pressure and volume of an ideal monatomic gas change from A to B to C, as the drawing shows. The curved line between A and C is an isotherm. IMAGE:wvw.webassign.n3t/cj8/15-p-031.gif a)Determine the total heat for the process in joules. b)State whether the flow of ...
*Sunday, November 29, 2015 by Jordan*

**Physics**

Anna notices a pyramid sticking out of an adjacent ravine and she wants to investigate. She notices some vines hanging over the ravine. To her luck, a strong breeze blows some of the vines toward her and she is able to grab one. The vine appears to make 10° angle with the ...
*Sunday, November 29, 2015 by colcol*

**Physics- Mastering Physics**

Predict how the range of the projectile will change when you change the angle from 45∘, keeping the speed constant. A The range increases with increase in angle and decreases with decrease in angle. B It increases with either an increase or decrease in angle. C It ...
*Sunday, November 29, 2015 by Vanessa*

**physics**

An object in equilibrium has three forces exerted on it. A 25 N force acts at 90 from the x-axis and a 48 N force acts at 60. What are the magnitude and direction of the third force
*Sunday, November 29, 2015 by Shane*

**physics**

A 30kg sled(with rider) slides without friction down a small, ice covered hill. On the first run the sled starts from rest and its speed at the bottom of the hill is 8.50m/s. On the second run the sled starts with a speed of 1.50m/s at the top. Find the speed of the sled at ...
*Sunday, November 29, 2015 by Shakedown78*

**Physics**

a see saw is balanced. left hand side is 3m long and has an applied force of 4N the righth hand side is 6m long and has an unknown force applied. what is that force?
*Sunday, November 29, 2015 by Cameron*

**Physics**

true or false.Initial velocity is always equal to zero
*Sunday, November 29, 2015 by Rose*

**PHYSICS**

A Solid Cube Of Steel Has Each Side 10cn Long.Find Its Mass If The Density Of Steel Is 6.5g/cm
*Sunday, November 29, 2015 by Dan*

**physics**

four particles of masses 1kg, 2kg,3kg, and 4kg are at vertices of a rectangle of sides a and b.if a=1m and b=2m find the location of the center of mass
*Sunday, November 29, 2015 by M*

**physics**

a persons heart and head are 1.3 meter and 1.8 meter above the feet,respectively.determine the potential energy of 0.5 kg of blood in the heart relative to feet and head
*Sunday, November 29, 2015 by rodel*

**physics**

A hot air balloon is ascending with a velocity of 5.0m/s. A 5.0kg mass is dropped from this balloon at a height of 80m. How much time will pass before the mass hits the ground
*Saturday, November 28, 2015 by raga*

**Physics**

The circular blade on a radial arm saw is turning at 293 rad/s at the instant the motor is turned off. In 17.9 s, the speed of the blade is reduced to 60 rad/s. Assume the blade to be a uniform solid disk of radius 0.17 m and mass 0.400 kg. Find the magnitude of the net torque...
*Saturday, November 28, 2015 by James*

**physics **

A uniform horizontal beam 5.00 m long and weighting 2.88 102 N is attached to a wall by a pin connection that allows the beam to rotate. Its far end is supported by a cable that makes an angle of 53.0° with the horizontal (Figure (a)). If a person weighing 5.99 102 N ...
*Saturday, November 28, 2015 by Johnny *

**Physics **

Using a ramp of length 2m, you apply a 150N force to move a 20kg object a vertical distance of 1m. How much work does gravity do on the object?
*Saturday, November 28, 2015 by Faith*

**Physics**

Using a ramp length of 2m, you apply a 150N force to move a 20kg object a vertical distance of 1m. How much work did you do on the object?
*Saturday, November 28, 2015 by Faith*

**physics**

A block of mass 0.941 kg is kept at rest as i compresses a horizontal mass-less spring (K=87.5 N/m) by 9.91 cm. As the block is released, it travels 0.528 m on a rough horizontal surface before stopping. The acceleration of gravity is 9.8 m/s^2. Calculate the coefficient of ...
*Saturday, November 28, 2015 by luma*

**physics**

A 72 kg man jumps fro a window 1.5 m above a sidewalk. The acceleration of gravity is 9.81 m/s^2. a) what is his speed just before his feet strike the pavement? Answer in units of m/s. b) If the man jumps with his knees and ankles locked, the only cushion for his fall is ...
*Saturday, November 28, 2015 by luma*

**physics**

An archer pulls her bowstring back 0.488 m by extending a force that increases uniformly from zero to 251 N. What is the equivalent spring constant of the bow? Answer in units of N/m. How much work does the archer do in pulling the bow? Answer in units of J.
*Saturday, November 28, 2015 by luma*

**physics**

An archer pulls her bowstring back 0.488 m by extending a force that increases uniformly from zero to 251 N. What is the equivalent spring constant of the bow? Answer in units of N/m.
*Saturday, November 28, 2015 by luma*

**physics**

On a frozen pond, a 10 kg sled is given a kick that imparts to it an initial speed of 6.2 m/s. The coefficient of kinetic friction between sled and ice is 0.14. Find the distance the sled moves before coming to rest. The acceleration of gravity is 9.8 m/s^2. Answer in units of m.
*Saturday, November 28, 2015 by luma*

**physics**

A 12 g bullet is accelerated in a rifle barrel 69.2 cm long to a speed of 864 m/s. Use the work-energy theorem to find the average force exerted on the bullet while it is being accelerated. Answer in units of N.
*Saturday, November 28, 2015 by luma*

**physics**

A 2.25 kg block initially at rest is pulled to the right along a horizontal, frictionless surface by a constant, horizontal force of 19.6 N. Find the speed of the block after it has moced 4.72 m. Answer in units of m/s.
*Saturday, November 28, 2015 by luma*

**Physics**

The block shown in (Figure 1) has mass m = 7.0 kg and lies on a fixed smooth frictionless plane tilted at an angle θ = 22.0 ∘ to the horizontal. If the block starts from rest 15.2 m up the plane from its base, what will be the block's speed when it reaches the ...
*Saturday, November 28, 2015 by Simone*

**Physics**

A river flows toward the East at 1.5 m/s. Steve can swim 2.2 m/s in still water. If he wishes to cross the river so that his direction is northward, what direction relative to the water must he swim?
*Saturday, November 28, 2015 by Al Hasiff*

**Physics **

Alex comes across a deep ravine. She was planning on this as she packed a 3.8 m portable telescoping extension ladder. It has a mass of 15 kg. She was told that in order to get to the skull’s last known location, she must get across this 2 m gap. ------- | \3.8m | \ _|_2m...
*Saturday, November 28, 2015 by colcol*

**College Physics**

A 0.60 kg mass is attached to a 0.6 m string and displaced at an angle of 15 degrees before it is released. 1)What is the potential energy of the pendulum? 2) What is the angular frequency of the pendulum? What is the height of its displacement? 4) What is the velocity of the ...
*Friday, November 27, 2015 by Jose Luis*

**College Physics**

A 0.60 kg mass is attached to a 0.6 m string and displaced at an angle of 15 degrees before it is released. 1)What is the potential energy of the pendulum? 2) What is the angular frequency of the pendulum? What is the height of its displacement? 4) What is the velocity of the ...
*Friday, November 27, 2015 by Jose Luis*

**physics**

a body of mass 5kg falls from a height of 10m above the ground. what is the kinetic energy of the body just before it strikes the ground answers K.E =1/2mg'2
*Friday, November 27, 2015 by richie*

**physics**

If 0.055 kg of ice at 0 ∘C is added to 0.330 kg of water at 32 ∘C in a 0.100-kg aluminum calorimeter cup, what is the final temperature of the water?
*Friday, November 27, 2015 by noel*

**physics**

A laser with a power output of 2 mW at a wavelength of 400 nm is projected onto a calcium metal surface. What power is carried away by the electrons? The binding energy of the metal is 2.31 eV.
*Friday, November 27, 2015 by carolyn*

**physics**

On its highest power setting, a microwave oven increases the temperature of 0.400 kg of spaghetti by 45.0 °C in 120 s. The specific heat of spaghetti is 3760 J/kg °C and the microwaves are absorbed over a circular area 20.0 cm in diameter. What is the peak electric ...
*Friday, November 27, 2015 by carolyn*

**physics**

A severely myopic patient has a far point of 5.00 cm. By how many diopters should the power of his eye be reduced in laser vision correction to obtain normal distant vision for him? Assume the image at the back of the eye is formed 0.2 m from the eye's lens.
*Friday, November 27, 2015 by carolyn*

**Physics**

A 0.60 kg mass is attached to a 0.6 m string and displaced at an angle of 15 degrees before it is released. 1)What is the potential energy of the pendulum? 2) What is the angular frequency of the pendulum? What is the height of its displacement? 4) What is the velocity of the ...
*Friday, November 27, 2015 by Jose Luis*

**Physics**

What is the difference between Electro-Motive-Force and Potential-Difference?
*Friday, November 27, 2015 by Joe*

**Physics**

A 0.60 kg mass is attached to a 0.6 m string and displaced at an angle of 15 degrees before it is released. 1)What is the potential energy of the pendulum? 2) What is the angular frequency of the pendulum? What is the height of its displacement? 4) What is the velocity of the ...
*Friday, November 27, 2015 by Jose Luis*

**Physics**

Water enters a pipe with a cross sectional area of 3.0 cm^2 with a velocity of 3.0 m/s. The water encounters a constriction where its velocity is 15 m/s. What is the cross sectional area of the constricted portion of the pipe?
*Friday, November 27, 2015 by Jose Luis*

**science**

I did a physics experiment and now i need help with the matlab fit. can someone tell me how to do this fit in matlab? a1*[sin(a2(x-a3))/(a2(x-a3)]^2*[cos(a4(x-a3))]^2 i have a program that fits a graph to a function i just ask how to write this function.
*Friday, November 27, 2015 by henry*

**physics**

a beam of electron 13.0 ev is used to bombard gaseous hydrogen. what series of wavelengths will be emitted?
*Friday, November 27, 2015 by ameer mukhtar *

**Physics**

A nonuniform cylinder (radius = 0.14 m, center-of-mass rotational inertia = 2.21×10^-2 kg·m^2, mass = 1.36 kg) starts from rest and rolls without slipping down a plane with an angle of inclination of 24.0 degrees. How long does it take to travel 1.72 m along the ...
*Friday, November 27, 2015 by Skippy*

**Physics**

A block with a mass m = 3.50 kg sits on a surface with a coefficient of static friction µs = 0.520. A spring with spring constant k = 75.0 N/m is hooked onto the block, and is slowly pulled horizontally, gradually stretching the spring. (a) When the spring is stretched ...
*Thursday, November 26, 2015 by Jade*

**physics**

Determine if the tow truck below must use mode 4 drive streets to climb the slope and the weight of the tow car is 3500kg weight of the car is 1800kg Coefficient of friction between the tires and the roadway is 0.3
*Thursday, November 26, 2015 by Gene*

**physics**

A car of mass 800kg is climbing an incline at 10 degrees to the horizontal. Determine the increase in potential energy of the car mass s it moves a distance of 50m up the incline
*Thursday, November 26, 2015 by Kyle*

**physics**

frictional force
*Thursday, November 26, 2015 by tolahun*

**Physics**

Joan comes across a deep ravine. She was planning on this as she packed a 3.8 m portable telescoping extension ladder. It has a mass of 15 kg. She was told that in order to get to the skull’s last known location, she must get across this 2 m gap. --- | \3.8m | \ __|_2m\...
*Thursday, November 26, 2015 by Lilly *

**Physics**

A spring has a spring constant that is 120 N/m, and has a 0.1 kg block attached to it. The spring and mass sit on a horizontal surface that has no friction. The block is pulled 0.2 m and then released. Please find the frequency of the oscillations, the period of the ...
*Thursday, November 26, 2015 by Jose Luis*

**physics**

A stretched string of length 168 cm vibrates in its nth mode. The separation distance from node to antinode is 21 cm . What is the value of n?
*Thursday, November 26, 2015 by Elia*

**physics**

Engine oil (η = 0.20 Pa⋅s) passes through a fine 2.60-mm-diameter tube that is 8.60 cm long. What pressure difference is needed to maintain a flow rate of 7.8 mL/min ? So what i did was (7.8Ee-3 /60) = π P (1.3e-3) ^4 /(8* 0.086*0.2) I get 1.99E5 but its not ...
*Wednesday, November 25, 2015 by arshi*

**physics**

A scuba tank, when fully submerged, displaces 15.7 L of seawater. The tank itself has a mass of 13.9 kg and, when "full," contains 3.20 kg of air. The density of seawater is 1025 kg/m3. Assume that only its weight and the buoyant force act on the tank. Determine the ...
*Wednesday, November 25, 2015 by arshi*

**physics**

A typical red blood cell has a mass of 3.0 10-16 kg. A blood sample placed in a centrifuge is subjected to a force of 4.6 10-11 N when the centrifuge is operated at 138 rev/s. What is the diameter of the centrifuge?
*Wednesday, November 25, 2015 by Yaacov*

**physics**

How does the concept of resonance work?
*Wednesday, November 25, 2015 by Emma*

**Physics**

Alex is exploring a cave that has a slight incline and is iced over, forcing her to use ice cleats to explore it. After climbing 50 m into the cave, she finds what she is looking for and she takes out her ice pick and hammer to begin removing the stones. Little does she know ...
*Wednesday, November 25, 2015 by cocol*

**Physics**

The asteroid EROS has a mass of 7.4x10+15kg. A 103kg astronaut stands on the surface, 33km from the centre of the asteroid. What weight does she experience ? Give your answer in Newtons. Take the Gravitational constnat, G, to be 6.67x10-11.
*Wednesday, November 25, 2015 by Bill Nye*

**Physics**

How does using the concept of resonance determine the speed of sound an in experiment? In other words, I'm wondering how the concept of resonance works
*Wednesday, November 25, 2015 by Emma*

**physics**

Explain two different reasons why fibreglass is used to fill the space between the concrete block and the metal casing.
*Wednesday, November 25, 2015 by Fernando Guo*

**Physics**

What is the mass of a copper wire that will give a wire, 0.20mm in diameter, a resistance of 400 ohms can you please show me the formulas
*Wednesday, November 25, 2015 by John*

**Physics**

In a container of negligible mass, 0.100 kg of steam at 110°C and atmospheric pressure is added to 1.00 kg of water at 20.0°C. (a) If no heat is lost to the surroundings, what is the final temperature of the system? (b) At the final temperature, how many kg of steam ...
*Wednesday, November 25, 2015 by Margret*

**Physics**

Three charges are located along the x axis as shown in the drawing. The mass of the -1.2 uC is 4.0×10^-9 kg. Determine the magnitude and direction of the acceleration of the -1.2 uC charge when it is allowed to move if the other two charges remain fixed. I need help ...
*Wednesday, November 25, 2015 by John*