Saturday

November 28, 2015
**PHYSICS**

Given a plane harmonic wave of wavelength , propagating with a speed v in a direction given by the unit vector (i ̂+ j ̂ )/√2 in Cartesian coordinates. Write an expression for the wave function. Here i ̂ ,j ̂,k ̂ are the usual unit basis...
*Sunday, November 22, 2015 by NOONY*

**PHYSICS**

1. Write an expression for a R - state lightwave of angular frequency and amplitude E0 propagating in the positive x-direction such that at t=0 and x=0 the E-field points in the negative z-direction.
*Sunday, November 22, 2015 by NOONY*

**Physics**

an elastic band is stretched a distance of 0.150m by a force of 100.0
*Sunday, November 22, 2015 by Anonymous*

**Physics**

To an order of magnitude, how many helium-filled toy balloons would be required to lift you? Because helium is an irreplaceable resource, develop a theoretical answer rather than an experimental answer. Assume that you have a mass of approximately 70 kg, the radius of a ...
*Sunday, November 22, 2015 by Student who needs help*

**Physics**

Which needs more energy: to heat 5 kg of copper from 20 degrees celcius to 50 degrees celcius or to heat 0.5 kg of water from 20 degrees celcius to 50 degrees celcius?
*Sunday, November 22, 2015 by Ann*

**Physics**

Two objects of different masses are joined by a light rod. a) Id the moment of inertia about the center of mas the minimum or maximum and why? b) If the two masses are 3kg and 5kg and the length of the rod is 2m, what are the moments of inertia of the system about an axis ...
*Sunday, November 22, 2015 by Anna*

**physics**

filament lamp: cost-80p efficiency-0.2 expected life- 1000 hours compact fluorescent lamp (CFL): cost- £3.00 efficiency-0.8 expected life- 8000 hours A filament lamp with a power rating of 100 w gives 2000 units of light. what power rating would a CFL need to provide ...
*Sunday, November 22, 2015 by sam*

**physics **

An object of size 3cm is placed 14cm in front of a concave lens of focal length 21cm calculate position and size of the image?
*Sunday, November 22, 2015 by Zainab *

**Physics**

Using the data in the table below,determine how many calories are needed to change 100g of solid x at 10degrees celcious to a vapour at 210degrees celcious:thermodynamic constants for substance x: heat of fusion 40,0cal/g heat of vaporization 150,0cal/g melting point 10,0'...
*Sunday, November 22, 2015 by John*

**Physics**

011 10.0 points Masses 18 kg and 9 kg are connected by a light string that passes over a frictionless pulley as shown in the figure. The acceleration of gravity is 9.8 m/s2 . 18 kg 9 kg If the 18 kg mass, initially held at rest on the table, is released and moves 1.7 m in 1.4 ...
*Saturday, November 21, 2015 by Madison*

**Physics**

The earth spins on its axis once a day and orbits the sun once a year (365 1/2 days). Determine the average angular velocity (in rad/s) of the earth as it (a)spins on its axis and (b) orbits the sun. In each case, take the positive direction for the angular displacement to be ...
*Saturday, November 21, 2015 by Jose Luis*

**Physics**

question 1 ..A 5 kg rock is thrown vertically upward at 12 m/s. How high did the rock rise? question 2 The driver of a truck traveling at 126 km/h on a highway sees a sign which indicated that 800 m after the sign the maximum speed will be 90 km/h . When the truck passes the ...
*Saturday, November 21, 2015 by Axe*

**lighthouse christian college**

Wich career can I take when I took english,afrikaans,lo,physics and pure maths?
*Saturday, November 21, 2015 by mthofire*

**physics**

A hunter fires 50 g bullets from a machine gun. If each bullet moves with a velocity of 150ms−1 how many such bullets are to be fired into a tiger of mass 60 kg coming towards him with a velocity of 10ms−1 in order to stop the tiger?
*Saturday, November 21, 2015 by Anonymous*

**Physics**

Szymon and Chris fly their balloon around the earth in 80 days. Taking the radius of the earth to be 6400 km, calculate their average speed in m/s. I did answered all the homework questions but I didn't know how to do this one?
*Saturday, November 21, 2015 by Andrew*

**physics**

A lineaer spring having a force constant k=40 N/m hangs vertically,supporting a 0.8 kg mass.the mass is then pulled down a distance of 0.15 m . During up and down oscillations ,the maximum speed of the mass will be..
*Saturday, November 21, 2015 by Abi*

**Physics **

A race car starts from rest on a circular track of radius 279 m. The car's speed increases at the constant rate of 0.760 m/s2. At the point where the magnitudes of the centripetal and tangential accelerations are equal, find the following a) the speed of the race car? m/s ...
*Saturday, November 21, 2015 by Anonymous*

**physics**

Two horses pull horizontally on ropes attached to a tree stump (Fig. 3). Each horse pulls with a force of magnitude F. If the angle between the two ropes is 126O, what is the resultant force?
*Saturday, November 21, 2015 by fiz*

**Physics AP**

A 32 kg child goes down a straight slide inclined 38∘ above horizontal. The child is acted on by his weight, the normal force from the slide, and kinetic friction. How large is the normal force of the slide on the child?
*Friday, November 20, 2015 by raquel *

**Physics**

A car of mass 1390 kg rests on a hydraulic lift with a piston of radius 0.26 m that is connected to a second piston of radius 0.033 m. If the car is just barely lifted off the ground, what is the force at the second piston? I Tried F1/F2 = r1^2 / r2^2 ==> 1390x10 / F2 = 0....
*Friday, November 20, 2015 by Noel*

**Physics**

A 180 pound body is dropped from a helicopter 5 miles (26400 ft.) up - - what maximum speed would the body attain, in miles per hour, before hitting the ground? Disregard gravity, air density, etc. factors, a very rough approximation is all that is needed. Thanks.
*Friday, November 20, 2015 by Bill*

**Physics**

A baseball player dives into third base with a speed of 7.90 m/s. If the coefficient of friction between the player and the ground is 0.41, how far does the player slide before coming to rest?
*Friday, November 20, 2015 by Alyyssa*

**Physics**

At the airport, you pull a 15kg suitcase across the floor with a strap that is at an angle of 45 degrees above the horizontal. Find the normal force and the tension in the strap if the suitcase is pulled at a constant speed and the coefficient of kinetic friction is 0.36.
*Friday, November 20, 2015 by Alyyssa*

**Physics**

A builder wants to build a corbeled arch, based on the principle of stability, what minimum number of bricks, each 0.30 m long, is needed if the arch is to span 1.0 m? Be sure to include in the total number of bricks one brick on top and one brick at the base of each half-span...
*Friday, November 20, 2015 by Anonymous2.0*

**Physics 12 college preparation **

Find the work done by a traveller carrying a suitcase of mass 8.2 kg by pulling up on it when walking forward for a distance of 120 m . Explain your reasoning
*Friday, November 20, 2015 by Ahmed*

**Physics**

A set of density rods is designed to illustrate the concept of density. The idea is to create cylinders of equal diameters and masses, but varying lengths, to show which have the largest and smallest densities. (a) Derive a formula that will predict the ratio of the length of ...
*Friday, November 20, 2015 by Alyssa*

**Physics**

Flywheels are large, massive wheels used to store energy. They can be spun up slowly, then the wheel's energy can be released quickly to accomplish a task that demands high power. An industrial flywheel has a 1.7 m diameter and a mass of 270 kg . Its maximum angular ...
*Friday, November 20, 2015 by Jay*

**physics**

what is the acceleration of a car going 25m/s on a cloverleaf with a radius of 45 m?
*Friday, November 20, 2015 by kelly*

**physics**

an object of height 5 cm is placed at a distance of 2m in front of a mirror and its image is obtained on a screen.Find the distance of screen from the mirror,nature of the mirror and its focal length.
*Friday, November 20, 2015 by Anonymous*

**physics**

why water from soil does not evaporate?
*Friday, November 20, 2015 by heat*

**Physics**

If a 180 pound body is dropped from an airplane 5 miles (26400 ft.) up: a/ how long would it take for the body to reach the ground? b/ what would be the maximum speed the body would attain in miles per hour? Close approximations are all that are required here. Thanks.
*Friday, November 20, 2015 by Bill*

**Physics**

Four bricks are to be stacked at the edge of a table, each brick overhanging the one below it, so that the top brick extends as far as possible beyond the edge of the table. *The construction in stable equilibrium, bricks must extend no more than (starting at the top) 1/2, 1/4...
*Friday, November 20, 2015 by Anonymous2.0*

**Physics [Help, need answer in 10 min]**

During a solar eclipse, the moon (of mass 7.36 × 1022 kg), Earth (of mass 5.98 × 1024 kg), and Sun (of mass 1.99 × 1030 kg) lie on the same line, with the moon between Earth and the Sun. What gravitational force is exerted on the moon by the Sun? The ...
*Thursday, November 19, 2015 by James*

**physics**

the following point charges are placed on the x-axis: +2.0μC at x=20cm,-3.0μC at x=30cm and -4.0μC at x=40cm. What is the potential at x=0?
*Thursday, November 19, 2015 by christine*

**physics**

two point charges +q and -q are separated by a distance d. aside from infinity, where else is the potential due to these two charges 0?
*Thursday, November 19, 2015 by christine*

**Physics**

If a 180 pound body was dropped from a plane 5 miles in the air - how long would it take for the body to reach the ground?
*Thursday, November 19, 2015 by Bill*

**Physics**

If you want to design a set of five density rods (made of aluminum, iron, copper, brass, and lead), determine the ratios of the lengths of each rod to the length of the lead rod, the densest material in the group. The specific gravities of the elements are approximately SG ...
*Thursday, November 19, 2015 by Alyssa*

**Physics**

Find the pressure at the bottom of a swimming pool that is 1.1 m deep.
*Thursday, November 19, 2015 by m*

**Physics**

A 5.0 kg skater begins a spin with an angular speed of 4 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one half its initial value. What is the skater's final angular speed? I know the answer to be 8 rad/s, however, I thank you ...
*Thursday, November 19, 2015 by Jose Luis*

**Physics**

At the moment when a shotputter releases a 7.26 kg shot, the shot is 2.0m above the ground and travelling at 15.0 m/s. It reaches a maximum height of 8.0m above the ground and then falls to the ground. Assume that air resistance is negligible. What is the final velocity of the...
*Thursday, November 19, 2015 by A*

**physics**

A series circuit consist of 6 ohms resistor,ammeter and battery. The current in the circuit is 0.5A but drops to 0.3A when another resistor of 8ohms is added in series. Find the battery e.m.f and its internal resistance?
*Thursday, November 19, 2015 by davies*

**Physics**

A 5.0 kg skater begins a spin with an angular speed of 4 rad/s. By changing the position of her arms, the skater decreases her moment of inertia to one half its initial value. What is the skater's final angular speed? I thank you in advance for your time. JL
*Thursday, November 19, 2015 by Jose Luis*

**Physics **

A cyclist travels a distance of 1200m due north before going 200m due east followed by 500m south-west.Draw a scale diagram to calculate the cyclist's displacement from her initial position.
*Thursday, November 19, 2015 by Amna*

**PHYSICS**

A BATH CONTAINS 100 KG OF WATER AT 60 DEGREES CELCIUS. HOT AND COLD TAPS ARE THEN TURNED ON TO DELIVER 20KG PER MINUTE EACH A TEMPERATURE 70 DEGREES CELSIUS AND 10 DEGREES CELSIUS RESPECTIVELY. HOW LONG WILL IT BE BEFORE THE TEMPERATURE IN THE BATH HAS DROPPED TO 45 DEGREES ...
*Thursday, November 19, 2015 by LANRE*

**Physics**

The 9-ball travelling and strikes the 13-ball, which is of equal mass and at rest. If this is an elastic collision, which statement below is true? Marks 3+4 = 7 a) All of the 9-ball’s energy and momentum are transferred to the 13-ball. b) All of the 9-ball’s energy ...
*Thursday, November 19, 2015 by Asma *

**Physics**

The following calculations are for EM radiation, for which the internal energy U=Vu, where u=u(T)is the total energy density. a) Show that (∂S/∂T)_v=V/T(du/dT), and (∂S/∂V)T=(u+P)/T Note: use the answers in part a in part b and c b) Using Stefan-...
*Thursday, November 19, 2015 by Sara*

**Physics**

The following calculations are for EM radiation, for which the internal energy U=Vu, where u=u(T)is the total energy density. a) Show that (∂S/∂T)_v=V/T(du/dT), and and (∂S/∂V)T=(u+P)/T Note: use the answers in part a in part b and c b) Using Stefan-...
*Thursday, November 19, 2015 by Sara*

**Physics**

A container is initially partitioned by a wall into two compartments. The left compartment has volume V1 and the right compartment has volume V2. Both compartments are filled with identical ideal gases at the same temperature T and with an equal number of particles N but at ...
*Thursday, November 19, 2015 by Paul*

**Physics**

The following calculations are for EM radiation, for which the internal energy U=Vu, where u=u(T)is the total energy density. a) Show that (∂S/∂T)_v=V/T(du/dT), and and (∂S/∂V)T=(u+P)/T Note: use the answers in part a in part b and c b) Using Stefan-...
*Thursday, November 19, 2015 by Sara*

**Physics**

Draw a sketch of a 2 pound book at rest on a level surface. Write a force inventory and draw a free body diagram.
*Wednesday, November 18, 2015 by PhysicsStudents*

**Physics**

Consider a 4.6 kilogram object moves from the origin always to the right (call that x-axis). Its speed increases uniformly (means constant acceleration) from zero to 0.667 metres/sec. 1.Describe how its velocity changes: initial, final and whether it changes uniformly. 2.The ...
*Wednesday, November 18, 2015 by PhysicsStudents*

**physics**

A 5.9 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.81 m/s/s If the upward acceleration of the bucket is 4.1 m/s/s, find the force exerted by the rope on the bucket of water. Answer in N
*Wednesday, November 18, 2015 by James*

**physics**

A 70 kg man stands at the end of a 12 m long platform. The end opposite to the man rests on the edge of a wall, and a support column is located a distance d = 3 m from the end with the man. The platform itself has a mass of 300 kg. (a) How much weight does the column support...
*Wednesday, November 18, 2015 by Alex*

**physics **

Two ice skaters of equal mass grab hands and spin in a circle once every four seconds. their arms are 0.76 m and they each have mass of 55.0 kg. how hard are they pulling on one another?
*Wednesday, November 18, 2015 by Anonymous*

**Physics**

3.A brown flower pot is dropped from an open window from the top floor of a brick apartment building on a Sunday afternoon in April. It fell 3.00 seconds before crashing into multiple pieces on the wet sidewalk below. How far did the flower pot fall?
*Wednesday, November 18, 2015 by Micheal*

**Physics**

2.An airplane flies north at a constant speed of 220 km/h. How far will the plane travel in 3.50 h?
*Wednesday, November 18, 2015 by Micheal*

**Physics**

3.A brown flower pot is dropped from an open window from the top floor of a brick apartment building on a Sunday afternoon in April. It fell 3.00 seconds before crashing into multiple pieces on the wet sidewalk below. How far did the flower pot fall?
*Wednesday, November 18, 2015 by Micheal*

**physics**

1.) A 7159 N piano is to be pushed up a(n) 2.26 m frictionless plank that makes an angle of 25.6 degrees with the horizontal. Calculate the work done in sliding the piano up the plank at a slow constant rate. Answer in units of J. 2.) A 20 g bullet is accelerated in a rifle ...
*Wednesday, November 18, 2015 by Balta*

**Physics**

Three vectors A,B and C have the following x and y components Ax = 3.6, Ay=-3.4; Bx=-5.5, By=1.9; Cx=2.5, Cy=3.4 What is the magnitude of A+B+C?
*Wednesday, November 18, 2015 by camile*

**Physics**

Two vectors F1 and F2 with magnitude F1=42N and F2=70N and where angle1=83 and angle2= 300. The angles are measures from the positive x axis with the counter-clockwise angular direction as positive. What is the magnitude of the resultant vector where F=F1+F2?
*Wednesday, November 18, 2015 by Melissa*

**physics**

What would be the orbital speed and period of a satellite in orbit 1.50 ✕ 10^8 m above the Earth?
*Wednesday, November 18, 2015 by Jackson*

**Physics**

A fence post is 50.0 m from where you are standing, in s direction of 37.0 degree north of east. A second fence post is due south from you. What is the distance of the second post from you,if the distance between the two posts is 80.0?
*Wednesday, November 18, 2015 by Tweetie*

**Physics**

A baggage handler throws a 16.0 kg suitcase horizontally along the floor of an airplane luggage compartment with an initial speed of 1.10 m/s . The suitcase slides 2.10 m before stopping.
*Wednesday, November 18, 2015 by Luis*

**physics**

During a baseball game, a batter hits a popup to a fielder 80 m away. The acceleration of gravity is 9.8 m/s2 . If the ball remains in the air for 5.5 s, how high does it rise? Answer in units of m.
*Wednesday, November 18, 2015 by Anonymous*

**physics**

Suppose the hand shown in (Figure 1) holds an 8.9-kg mass. The total mass of the arm is 3.3 kg. What force, FM, is required of the deltoid muscle, assuming the mass is 52 cm from the shoulder joint? So ive tried this problem multiple times but i'm not getting the correct ...
*Wednesday, November 18, 2015 by arshi*

**Physics**

A block of mass 4 kg, which has an initial speed of 2 m/s at time t = 0, slides on a horizontal surface. Find the magnitude of the work that must be done on the block to bring it to rest. Answer in units of J. If a constant friction force of magnitude 5 Newtons is exerted on ...
*Wednesday, November 18, 2015 by Madi*

**Physics**

A 4.17 g bullet moving at 506.1 m/s penetrates a tree trunk to a depth of 4.64 cm. a) Use work and energy considerations to find the magnitude of the force that stops the bullet. Answer in units of N. b) Assuming that the frictional force is constant, determine how much time ...
*Wednesday, November 18, 2015 by Madi*

**Physics**

The efficiency of a pulley system is 47 percent. The pulleys are used to raise a mass of 47 kg to a height of 7.0 m. The acceleration of gravity is 9.81 m/s 2 . What force is exerted on the rope of the pulley system if the rope is pulled for 28 m in order to raise the mass to ...
*Wednesday, November 18, 2015 by Madi*

**physics**

A 20 g bullet is accelerated in a rifle barrel 45 cm long to a speed of 354 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.
*Wednesday, November 18, 2015 by Madi*

**Physics**

A 7159 N piano is to be pushed up a(n) 2.26 m frictionless plank that makes an angle of 25.6 ◦ with the horizontal. Calculate the work done in sliding the piano up the plank at a slow constant rate. Answer in units of J.
*Wednesday, November 18, 2015 by Madi*

**physics**

A 48-kg box is being pushed a distance of 7.5 m across the floor by a force Upper POverscript right-arrow EndScripts whose magnitude is 185 N. The force Upper POverscript right-arrow EndScripts is parallel to the displacement of the box. The coefficient of ...
*Wednesday, November 18, 2015 by Hannah*

**Physics**

Water flows at 2.4 m/s through a garden hose of diameter 1.59 cm and emerges from a nozzle of radius 0.64 cm. If the nozzle is directed vertically upward, to what height would the water rise?
*Wednesday, November 18, 2015 by Chai*

**Physics**

The gravitational force of attraction between two students sitting at their desks in physics class is 2.23 ✕ 10-8 N. If one student has a mass of 52.0 kg and the other student has a mass of 57.4 kg, how far apart are the students sitting?
*Wednesday, November 18, 2015 by Jackson*

**physics**

A pistol of mass 2 kg fires a bullet of mass 50 g. The bullet strikes a stationary block of mass 1 2 kg. If the block, with the bullet embedded in it, moves with a velocity of 4 m/s, the recoil velocity of the pistol will be (Ignore friction and air resistance)
*Wednesday, November 18, 2015 by aparna*

**physics**

A fence post is 52.0 m from where you are standing, in a direction 37.0 degree north of east. A second fence post is due south from you. What is the distance of the second post from you, if the distance between the two posts is 80.0 m?
*Wednesday, November 18, 2015 by tweetie*

**Physics**

Kim an entrepreneur students walks 20m,30°NE,then turns N 30m,and takes 40m W and finally 20m 45°SE to reach the building for his next class.what is kims total displacement
*Wednesday, November 18, 2015 by Anie*

**physics**

A fence post is 52.0 m from where you are standing, in a direction 37.0 degree north of east. A second fence post is due south from you. What is the distance of the second post from you. If the distance between the two posts is 80.0 m?
*Wednesday, November 18, 2015 by tweetie*

**Physics**

Tarzan tries to cross a river by swinging from one bank to the other on a vine that is 11.2 m long. His speed at the bottom of the swing is 7.0 m/s. Tarzan does not know that the vine has a breaking strength of 1.0 ✕ 103 N. What is the largest mass that Tarzan can have ...
*Wednesday, November 18, 2015 by Jackson*

**PHYSICS**

A meter stick lies along the x-axis, centered at the origin. An upward force of 6.0 N is applied at x = 30 cm, and an upward force of 8.0 N is simultaneously applied at x = −40 cm. What is the net torque on the meter stick, taking into account usual sign conventions?
*Wednesday, November 18, 2015 by Anonymous*

**physics**

a 50kg box on a ramp needs to be lifted 3m using a force of 100N. What tpe of pulley system could do the work? What type of lever system?
*Tuesday, November 17, 2015 by A*

**Physics**

Starting with an initial speed of 3.86 m/s at a height of 0.480 m, a 1.78-kg ball swings downward and strikes a 4.75-kg ball that is at rest, as the drawing shows. (a) Using the principle of conservation of mechanical energy, find the speed of the 1.78-kg ball just before ...
*Tuesday, November 17, 2015 by Hannah*

**PHYSICS**

In an old house, the heating system uses radiators, which are hollow metal devices through which hot water or steam circulates. In one room the radiator has a dark color (emissitivity = 0.810). It has a temperature of 65.0 oC. The new owner of the house paints the radiator a ...
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

In an old house, the heating system uses radiators, which are hollow metal devices through which hot water or steam circulates. In one room the radiator has a dark color (emissitivity = 0.810). It has a temperature of 65.0 oC. The new owner of the house paints the radiator a ...
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

The amount of radiant power produced by the sun is approximately 3.9 × 1026 W. Assuming the sun to be a perfect blackbody sphere with a radius of 6.96 × 108 m, find its surface temperature (in kelvins).
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

A person's body is covered with 1.28 m2 of wool clothing. The thickness of the wool is 2.07 × 10-3 m. The temperature at the outside surface of the wool is 13.8 °C, and the skin temperature is 34.6 °C. How much heat per second does the person lose due to ...
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

Ideally, when a thermometer is used to measure the temperature of an object, the temperature of the object itself should not change. However, if a significant amount of heat flows from the object to the thermometer, the temperature will change. A thermometer has a mass of 31.2...
*Tuesday, November 17, 2015 by Anonymous*

**Physics: Static Equilibrium**

Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of è with the wall. The right-hand cable had tension 960 N and makes an angle of è1 with the ceiling. a) What is the angle è1 which the right...
*Tuesday, November 17, 2015 by Adrian*

**PHYSICS**

Interactive Solution 12.29 presents a model for solving problems of this type. A thin spherical shell of silver has an inner radius of 5.64 x 10-2 m when the temperature is 24.1 °C. The shell is heated to 133 °C. Find the change in the interior volume of the shell.
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

A steel section of the Alaskan pipeline had a length of 58.4 m and a temperature of 24.5 °C when it was installed. What is its change in length when the temperature drops to a frigid -45.7 °C?
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

Suppose you are hiking down the Grand Canyon. At the top, the temperature early in the morning is a cool 3.36 °C. By late afternoon, the temperature at the bottom of the canyon has warmed to a sweltering 33.1 °C. What is the difference between the higher and lower ...
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

The latent heat of fusion for water is 33.5 × 104 J/kg, while the latent heat of vaporization is 22.6 × 105 J/kg. What mass m of water at 0 °C must be frozen in order to release the amount of heat that 2.47 kg of steam at 100 °C releases when it condenses?
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

Astronauts on a distant planet set up a simple pendulum of length 1.2 m. The pendulum executes simple harmonic motion and makes 100 complete oscillations in 450 s. What is the magnitude of the acceleration due to gravity on this planet?
*Tuesday, November 17, 2015 by Anonymous*

**Physics**

If 7.20 kg of ice at -5.00°C is added to 12.0 kg of water at 30°C, compute the final temperature.
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

A spring is hung from the ceiling. A 0.477 -kg block is then attached to the free end of the spring. When released from rest, the block drops 0.153 m before momentarily coming to rest, after which it moves back upward. (a) What is the spring constant of the spring? (b) Find ...
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

A block of mass m = 0.889 kg is fastened to an unstrained horizontal spring whose spring constant is k = 89.4 N/m. The block is given a displacement of +0.128 m, where the + sign indicates that the displacement is along the +x axis, and then released from rest. (a) What is the...
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

Water flowing out of a horizontal pipe emerges through a nozzle. The radius of the pipe is 1.5 cm, and the radius of the nozzle is 0.42 cm. The speed of the water in the pipe is 0.68 m/s. Treat the water as an ideal fluid, and determine the absolute pressure of the water in ...
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

The truck in that example is traveling at 19 m/s. The density of air is 1.29 kg/m3. By how much does the pressure inside the cargo area beneath the tarpaulin exceed the outside pressure?
*Tuesday, November 17, 2015 by Anonymous*

**PHYSICS**

A duck is floating on a lake with 22% of its volume beneath the water. What is the average density of the duck?
*Tuesday, November 17, 2015 by Anonymous*

**Physics: Static Equilibrium**

Consider the 667 N weight held by two cables shown below. The left-hand cable had tension 890 N and makes an angle of è with the wall. The right-hand cable had tension 960 N and makes an angle of è1 with the ceiling. a) What is the angle è1 which the right...
*Tuesday, November 17, 2015 by Adrian*

**Physics**

Imagine a horizontal spring with an elastic constant of 26.5 N/m, held in place just above an air table. If a 2.00 kg mass traveling at 1.50 m/s slams axially into the end of the spring, by how much will it be compressed in bringing the mass to rest?
*Tuesday, November 17, 2015 by Eric*