Friday

September 30, 2016
**physics**

A tourist being chased by an angry bear is running in a straight line toward his car at a speed of 3.55 m/s. The car is a distance d away. The bear is 17.1 m behind the tourist and running at 4.84 m/s. The tourist reaches the car safely. What is the maximum possible value for d?

*Sunday, January 31, 2016 by Kim*

**physics**

A blue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.2 m/s2. A green car arrives at the position of the stop-light 7.5 s after the light had turned green. What is the slowest constant speed which the green car can ...

*Sunday, January 31, 2016 by hannah *

**Physics**

A cannonball is fired with initial speed v0 at an angle 30° above the horizontal from a height of 42.9 m above the ground. The projectile strikes the ground with a speed of 1.2v0. Find v0.

*Sunday, January 31, 2016 by Nicole*

**Physics**

An arrow is shot from a height of 1.5 m toward a cliff of height . It is shot with a velocity of 30 m/s at an angle of 60 deg above the horizontal. It lands on the top edge of the cliff 4.0 s later. (a) What is the height of the cliff? (b) What is the maximum height reached by...

*Sunday, January 31, 2016 by Jeff*

**physics**

A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 2.70 s. (a) Find the average acceleration of the plane. (answer in m/s^2) (b) Assuming the acceleration is constant, find the distance the plane moves. answer ...

*Sunday, January 31, 2016 by joanna*

**physics**

A ball is thrown directly downward with an initial speed of 8.95 m/s, from a height of 29.0 m. After what time interval does it strike the ground? answer in (in seconds)

*Sunday, January 31, 2016 by joanna*

**physics**

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? (in meters) (b) How long does it take to reach its highest point? (in seconds)

*Sunday, January 31, 2016 by joanna*

**physics Help please!**

h(m) KE (J) PEgravity (J) PEelastic (J) E 0 ______ _________ _________ __ 0.2 ______ _________ __________ ___ 0.4 ______ _________ __________ __ A 2.40-kg object is hanging from the end of a vertical spring. The spring constant is 31.0 N/m. The object is pulled 0.200 m ...

*Sunday, January 31, 2016 by mike*

**Physics**

What is the likely identity of a substance (see Table 10-1) if a sample has a mass of 9.38 g when measured in air and an apparent mass of 8.55 g when submerged in water? A)Copper B)Iron or steel C)Aluminum D) Lead E)Concrete F)Gold

*Sunday, January 31, 2016 by Larisa*

**Physics**

Suppose a soccer player kicks the ball from a distance 30 m toward the goal. Find the initial speed of the ball if it just passes over the goal, 2.4 m above the ground, given the initial direction to be above the horizontal.

*Sunday, January 31, 2016 by Drew*

**physics**

Two force of 5n and 12n respectively act on the same point.show how you would determine the magnitude of the resultant by using the tail- to head and tail to tail methods and Pythagoras theorem (13n)

*Sunday, January 31, 2016 by Bontle Letsoalo*

**Physics**

A speaker has a diameter of 0.303 m. (a) Assuming that the speed of sound is 343 m/s, find the diffraction angle è for a 1.80-kHz tone. (b) What speaker diameter D should be used to generate a 3.72-kHz tone whose diffraction angle is as wide as that for the 1.80-kHz ...

*Sunday, January 31, 2016 by Japhet*

**Physics**

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] ...

*Sunday, January 31, 2016 by Matt Damon*

**physics**

what is tripple point?

*Sunday, January 31, 2016 by promise*

**physics**

Imagine a parallel universe in which the electric force has the same properties as in our universe but there is no gravity. In this parallel universe, the sun carries charge Q, the earth carries charge −Q, and the electric attraction between them keeps the earth in orbit...

*Sunday, January 31, 2016 by jack*

**physics**

An electron is projected with an initial speed of (1.90x10^6 m/s) into the uniform field between two parallel plates. Assume that the field between the plates is uniform and directed vertically downward, and that the field outside the plates is zero. The electron enters the ...

*Sunday, January 31, 2016 by jack*

**Physïcs**

A body is displaced through a certain distance x by a force of 30 newtons.if the work done is 100 joules and the displacement is in the direction of force,what is the value of x?

*Sunday, January 31, 2016 by CHIDIEBERE*

**PHYSICS:**

A boy weighing 350N runs up a flight of stairs consisting of 20 steps each 10 cm high in 10 seconds.what is his power?

*Sunday, January 31, 2016 by CHIDI*

**physics**

A ball is thrown directly downward with an initial speed of 8.95 m/s, from a height of 29.0 m. After what time interval does it strike the ground?

*Sunday, January 31, 2016 by joanna*

**physics**

A ball is thrown vertically upward with a speed of 19.0 m/s. (a) How high does it rise? (b) How long does it take to reach its highest point? (c) How long does the ball take to hit the ground after it reaches its highest point? (d) What is its velocity when it returns to the ...

*Sunday, January 31, 2016 by jojo*

**physics**

A jet plane lands with a speed of 81 m/s and can accelerate at a maximum rate of −5.00 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest? (b) Can this plane land on a small tropical ...

*Sunday, January 31, 2016 by jojo*

**physics**

A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 205 mi/h in 2.70 s. (a) Find the average acceleration of the plane. (b) Assuming the acceleration is constant, find the distance the plane moves.

*Sunday, January 31, 2016 by jojo*

**Physics**

A 9.7 kg block moving at 3 m/s makes a head-on elastic collision with a stationary block of mass 7.6 kg. Find the velocity of the 7.6 kg block. Answer in units of m/s.

*Sunday, January 31, 2016 by Briana*

**Physics**

A 1000-kg aircraft going 25 m/s collides with a 1500-kg aircraft that is parked. They stick together after the collision and are moving at 10 m/s. If they skid for 30 seconds before stopping, how far (in meters) did they skid? Hint: Are the aircraft moving at a constant ...

*Saturday, January 30, 2016 by Bill*

**physics**

Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) direction for the resultant that occurs ...

*Saturday, January 30, 2016 by Lydia*

**physics**

Can anyone help just can figure it out. Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) ...

*Saturday, January 30, 2016 by Lydia*

**physics**

Multiple Concept Example 9 provides background pertinent to this problem. The magnitudes of the four displacement vectors shown in the drawing are A = 17.0 m, B = 10.0 m, C = 11.0 m, and D = 23.0 m. Determine the (a) magnitude and (b) direction for the resultant that occurs ...

*Saturday, January 30, 2016 by Lydia*

**Physics**

Find the center of mass of two objects, one of mass M and one of mass m, separated by distance L? At R1 = L * (1 - m/(m+M)) from m and R2 = m * L/(m+M) from M At R1 = L^2 x (1 - m/(m+M)) from m and R2 = m * L^2/(m+M) from M At R1 = m * L/(m+M) from m and R2 = L * (1 - m/(m+M...

*Saturday, January 30, 2016 by Shantal*

**PHYSICS**

At what height above the ground must a body of mass 10kg be situated inorder to have potential energy equal in value to the kinetic energy possessed by another body of mass 10kg moving with a velocity of 10m/s?

*Saturday, January 30, 2016 by Anonymous*

**Physics**

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] ...

*Saturday, January 30, 2016 by KevJumba*

**PHYSICS**

Can an act of fissure destroy a blackhole

*Saturday, January 30, 2016 by TRYSYENS*

**Physics 201**

A diver springs upward from a board that is 2.90 meters above the water. At the instant she contacts the water her speed is 9.11 m/s and her body makes an angle of 78.2° with respect to the horizontal surface of the water. Determine her initial velocity.

*Saturday, January 30, 2016 by Kenisha Frinks*

**Physics**

Find energy of an X-ray photon which can impart maximum energy of 50 keV to electron?

*Saturday, January 30, 2016 by Sachin *

**Physics**

find the angle of banking of curved railway track of radius 600m if the maximum saftey sppedd limit is 54;km/hr .if distance beetween the rails is 1.6m find elevation ofvthe outervtrack above the inner track

*Friday, January 29, 2016 by Rahul*

**Physics**

Charge A, +1 μC, is positioned at the origin of a coordinate system as shown below. Charge B, −1 μC, is fixed at x = 3 m. (a) Determine the magnitude and direction of the force that charge B exerts on charge A. (b) What is the force that charge A exerts on ...

*Friday, January 29, 2016 by Alyssa*

**Physics**

Charge A, +1 μC, is positioned at the origin of a coordinate system as shown below. Charge B, −1 μC, is fixed at x = 3 m. (a) Find the electric field on the x axis at x = 6 cm. (b) At what point on the x axis is the electric field zero?

*Friday, January 29, 2016 by Alyssa*

**Physics**

(a) Estimate the positive charge in you due to the protons in the molecules present in your body. (Assume that the human body is made entirely out of water.) (b) What is the net charge in your body?

*Friday, January 29, 2016 by Alyssa*

**physics**

A ball is thrown off a balcony (40 m high) and has an initial velocity of 18 m/s horizontally. (a) Determine the position of the ball at t = 4.0 s. (b) Determine the position after 4.0s?

*Friday, January 29, 2016 by anonymous*

**physics**

An object is moved left to right horizontally 2 meters while a force of 3 Newtons to the left acts. No other forces act on the object. Draw a diagram of showing the displacement and the force and calculate the work done on the object in Joules.

*Friday, January 29, 2016 by callie*

**physics projectile**

a body is projected horizontally with a velocity of 80m/s from the top of a tower 160m above the ground. find the time of flight,range,velocity at which the body strikes the ground

*Friday, January 29, 2016 by wisdom*

**Physics**

On earth, two parts of a space probe weigh 14500 N and 6400 N. These parts are separated by a center-to-center distance of 19 m and may be treated as uniform spherical objects. Find the magnitude of the gravitational force that each part exerts on the other out in space, far ...

*Friday, January 29, 2016 by Melanie*

**Physics**

A truck starts from rest and accelerates at 2.0 m/s² for 4.0 s. How far will it have gone at the end of this time?

*Friday, January 29, 2016 by Anonymous*

**PHYSICS**

explain how exotic matter stabilizes a wormhole,google's answer was not direct

*Friday, January 29, 2016 by STEVIUM*

**Physics**

A metal sphere is launched with an initial velocity of 1.5 m/s as it leaves the ramp. The end of the ramp is 1.20 m above the floor. Calculate the range of the sphere.
(Range is the horizontal displacement of the projectile.)

*Friday, January 29, 2016 by Jake Lammers*

**physics **

find a unit vector parallel to the resultant of vectors : A=2i^+j^-k^& B=3i^-2j^+2k^

*Friday, January 29, 2016 by gurleen*

**physics**

a metal ball falls from a. height 1m onto a. steel. plate and jump. up. to a. height of. 0.81m. .find. the. coefficient of restitution

*Friday, January 29, 2016 by Anonymous*

**sciense(physics)**

a car of mass 100kg travering at 36km/h is brought to rest over a distance of 40m.calculate(a)accelaration(b)the average abreaking force

*Thursday, January 28, 2016 by luckson*

**Physics**

Tarzan (80 kg) runs toward a vine at 4.8 m/s where Jane (60 kg) is hanging on. He jumps and grabs the vine. How high does the vine swing? If the vine is 25 m long, how much of an angle does that make?

*Thursday, January 28, 2016 by Alyssa*

**Physics**

A boy on a swing reaches a maximum height of 3.2 m and a minimum height of .55 m. What is the speed of the boy at the lowest point if the boy has a mass of 34 kg? v(final)=?

*Thursday, January 28, 2016 by Tori *

**physics**

A 10 kg mass moving at 6 m/s strikes a stationary 2 kg mass in an elastic collision. Determine the velocity of each after the collision. 10(6)+2(0)=(10)Vf1+(2)Vf2 60=(10)Vf1+(2)Vf2

*Thursday, January 28, 2016 by alyssa*

**Physics**

In the figure we see two blocks connected by a string and tied to a wall, with θ = 27°. The mass of the lower block is m = 1.2 kg; the mass of the upper block is 2.0 kg.

*Thursday, January 28, 2016 by Oreos*

**Physics **

A projectile is shot on level ground with a horizontal velocity of 21 m/s and a vertical velocity of 45 m/s. Part 1) Find the time the projectile is in the air. The acceleration due to gravity is 9.8 m/s^2 .Answer in units of s. Part 2) Find the range R. Answer in units of m. ...

*Thursday, January 28, 2016 by John Abrham*

**Physics help **

Did i do number 2 and 3 correct? 2. A billiard ball (0.62 kg) with a velocity of 2.0 m/s [N] hits another ball and has a velocity of 1.7 m/s [E] after the collision. Determine the impulse on the ball and the average force exerted on it during the collision if the duration of ...

*Thursday, January 28, 2016 by I NEED DAMON'S HELP*

**Physics**

In the figure we see two blocks connected by a string and tied to a wall, with θ = 27°. The mass of the lower block is m = 1.2 kg; the mass of the upper block is 2.0 kg.

*Thursday, January 28, 2016 by Oreos*

**Physics help **

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] ...

*Thursday, January 28, 2016 by I NEED DAMON'S HELP*

**Physics help **

Are you sure that's how you do #4 because they have 2 different directions. I need physics help. I don't understand how to do these questions. Can someone show me what I should use? and explain. I'll do calculations by myself. A stationary curling stone is struck ...

*Thursday, January 28, 2016 by HENRY - I NEED YOUR HELP?*

**Physics help **

A car with a mass of 1800 kg is initially travelling with a velocity of 22 m/s [N] when it collides with a truck with a mass of 3200 kg traveling with a velocity of 14 m/s [E]. If the two vehicles become attached during the collision, determine their final velocity.

*Thursday, January 28, 2016 by JACKIE CHAN*

**Physics - Am I correct? **

I'm preparing for a test. Can anyone check my answer for all these questions? These are my questions: 1. A stationary curling stone is struck in a glancing collision by a second curling stone of equal mass. If the first stone moves away at a velocity of 0.92 m/s [N71oW] ...

*Thursday, January 28, 2016 by JOHN CENA*

**maths/physics**

4. Write down a diﬀerential equation to express each of the following relationships: (a) The rate at which the volume of a sphere changes with radius is proportional to the square of the radius. (b) Gravitational attraction F between two given bodies of masses m1 and m2...

*Thursday, January 28, 2016 by Sarah*

**Physics (**

3. Terminal velocity of an object in freefall is given by Vt = root 2gMA/Cdñ , where g is gravitational acceleration,Cd is the coefficient of drag, p is air density, and MA is the ratio M/A of mass M to ‘downwards facing’ area A. For a falling sphere of radius...

*Thursday, January 28, 2016 by Sarah*

**Physics (Gravitation)**

2. To leave the gravitational ﬁeld of a planet, a space rocket must be launched at an escape velocity of: ve =r2GM r , where G is the gravitational constant G ¡Ö 6.8¡Á10−11Nm2/kg2, M is the mass of the planet and r is its radius. Suppose ...

*Thursday, January 28, 2016 by Sarah*

**Physics**

A man uses a lever jack to lift a 2.00 × 10^3 kg car to change a tire. Each stroke of the jack lifts the car a distance of 5.00 × 10^(-3) m. The vertical displacement of the handle is 0.75 m for each stroke. How much total force does he use with each stroke of the ...

*Thursday, January 28, 2016 by Grace*

**physics**

How much positive charge is in 0.8 kg of neon? The atomic weight (20.1797 g) of neon contains Avogadro’s number of atoms, with each atom having 10 protons and 10 electrons. The elemental charge is 1.602 × 10−19 C and Avogadro’s number is 6.023 × ...

*Thursday, January 28, 2016 by sami*

**physics**

can anyone help me in this question please A particle of mass 27 g and charge 32 µC is released from rest when it is 79 cm from a second particle of charge −22 µC. Determine the magnitude of the initial acceleration of the 27 g particle. Answer in units of m/...

*Thursday, January 28, 2016 by alin*

**physics **

In a thundercloud there may be an electric charge of 46 C near the top of the cloud and −46 C near the bottom of the cloud. If these charges are separated by about 6 km, what is the magnitude of the electric force between these two sets of charges? The value of the ...

*Thursday, January 28, 2016 by sally*

**physics **

A transverse wave is traveling through a canal. If the distance between two successive crests is 2.97 m and four crests of the wave pass a buoy along the direction of travel every 20.6 s, determine the following.

*Thursday, January 28, 2016 by kristina *

**Physics**

a stone is thrown at an angle of 30 degrees above the horizontal from the top edge of a cliff with an initial speed of 12m/s. a stop watch measures the stone's trajectory time from top of cliff to bottom to be 8s. how far out from the cliff's edge does the stone travel...

*Thursday, January 28, 2016 by S*

**Physics**

an airplane has a velocity of 499 km/h relative to the moving air. at the same time, a wind blows northward with a speed of 87 km/h relative to the earth. the airplane is moving in an easterly direction relative to the earth. find speed of airplane to relative to earth.

*Thursday, January 28, 2016 by S*

**Physics**

A tennis player strikes a ball when it is 2.20m above the ground, with a velocity 18.7 m/s at 20 degrees above the horizontal. The net is 5m away horizontally and it is 0.90m high. after 0.37 seconds, what is the direction of the ball with respect to the horizontal?

*Thursday, January 28, 2016 by S*

**PHYSICS**

It has two flags, each exactly 25.4 mm long, with the midpoints of the flags separated by 162 mm. The first flag interrupts the photogate timer for a time 50 ms, and the second flag interrupts the photogate timer for a time 45 ms. -What was the average velocity of the glider ...

*Thursday, January 28, 2016 by Anonymous*

**PHYSICS**

Can light speed be accelerated and why

*Thursday, January 28, 2016 by STEVIUM*

**Physics**

Assume a goose has a 2.0-cm-thick layer of feather down (on average) and a body surface area of 0.14 m2 . What is the rate of heat loss (conduction only) if the goose, with a body temperature of 41 ∘C, is outside on a winter day when the air temperature is 6 ∘C?

*Thursday, January 28, 2016 by Bernardo*

**Physics**

Alright, I can't figure it out, here's the problem. 3. A boy is giving his little sister a ride in the wagon. He pulls with an applied force of 20N. The frictional force against him is 20N and the sled is traveling 2m/s. If the boy pulls the wagon 45m, how much work ...

*Thursday, January 28, 2016 by Ashtin*

**physics**

2)if a curved of radius 50m is banked at 30 degree will a car travelling at 60 km/hr along the curve will safe?

*Thursday, January 28, 2016 by Rutvik*

**Physics **

Calculate the torque on a coil in a motor of length 0.2m and a width of 0.1m which carries a current of 5A placed in a magnetic field of 0.5T and has 1 turn.

*Thursday, January 28, 2016 by Jack Brown*

**Physics**

A body weighs 60g in air and 40g in water . the specific gravity 100g in air

*Thursday, January 28, 2016 by Banajyotsna*

**Physics**

From the top of a tall building, a gun is fired. The bullet leaves the gun at a speed of 340 m/s, parallel to the ground. As the drawing shows, the bullet puts a hole in a window of another building and hits the wall that faces the window. (y = 0.42 m, and x = 6.4 m.) Using ...

*Thursday, January 28, 2016 by Adriana*

**Physics**

As preparation for this problem, review Conceptual Example 10. The drawing shows two planes each about to drop an empty fuel tank. At the moment of release each plane has the same speed of 140 m/s, and each tank is at the same height of 4.00 km above the ground. Although the ...

*Thursday, January 28, 2016 by Adriana*

**Physics **

A ball is thrown upwards with an initial velocity of 70 m/s 1. What is the velocity after 3 seconds? 2. What is the acceleration at the top of its path? 3. How many seconds does it take the ball to go up? 4. How many seconds does it take to hit the ground? 5. How high does the...

*Thursday, January 28, 2016 by Mateo*

**Physics**

If A Wire Of Length 250m Is Place In A Magnetic Field Of 575militesla And Conductor Move 25m/s Across The Field, Find The E.M.F Induce

*Thursday, January 28, 2016 by Uduakobong*

**Physics**

A thin metallic spherical shell of radius .5m has a total charge of 8 μC uniformly distributed on it. At the center of the shell is placed a point charge of 4 μC. What is the electric field at a distance of .15 m from the center of the spherical shell? I know that EA...

*Wednesday, January 27, 2016 by Joe*

**Physics**

It has two flags, each exactly 25.4 mm long, with the midpoints of the flags separated by 162 mm. The first flag interrupts the photogate timer for a time 50 ms, and the second flag interrupts the photogate timer for a time 45 ms. 1) What was the average velocity of the glider...

*Wednesday, January 27, 2016 by Anonymous*

**physics**

The speed of a space shuttle is 3.2×10^6 cm/s. Convert this into miles per hour (mph) using only 12 inches/ft, 60 seconds/min, 60 minutes/hour, and 1 inch = 2.54 cm. Factor Analysis must be used. Express your result to three significant digits and in scientific notation.

*Wednesday, January 27, 2016 by sam*

**Physics**

A particle of mass 57 g and charge 70 µC is released from rest when it is 34 cm from a second particle of charge −12 µC. Determine the magnitude of the initial acceleration of the 57 g particle. Answer in units of m/s2.

*Wednesday, January 27, 2016 by Ayo*

**Physics**

A rock dropped from the top of a building takes 0.55 s to fall the last 50% of the distance from the top to the ground.How tall is the building?

*Wednesday, January 27, 2016 by Anonymous*

**physics**

A batter hits a ball, causing it to leave the bat at 135 m/s and at an angle of 18.3 degrees from the horizontal. If the baseball field is level, and ignoring the height at which the batter hits the ball, how far (horizontally, in meters) away from the batter does the ball hit...

*Wednesday, January 27, 2016 by julia*

**physics**

Position vector r⃗ has magnitude of 15.0 m and direction angle 250 ∘. Find its components. Find the components, magnitude, and direction of the vector −2r⃗ . Where do I start?

*Wednesday, January 27, 2016 by brad*

**physics**

In a cathode-ray tube, electrons are projected horizontally at 1.0×10^6 m/s and travel a horizontal distance 11.5 cm across the tube. How long are the electrons in flight? Express your answer to two significant figures and include the appropriate units. Find the vertical...

*Wednesday, January 27, 2016 by julia*

**Physics**

A charge of -3.17 μC is fixed at the center of a compass. Two additional charges are fixed on the circle of the compass (radius = 0.115 m). The charges on the circle are -3.96 μC at the position due north and +5.03 μC at the position due east. What is the ...

*Wednesday, January 27, 2016 by Abby*

**physics**

In a marathon race, Chad is out in front, running due north at a speed of 4.09 m/s. John is 94 m behind him, running due north at a speed of 4.28 m/s. How long does it take for John to pass Chad?

*Wednesday, January 27, 2016 by Rhonda*

**physics**

When driving west toward the Rocky Mountains, you see a peak 2.6 ∘ above the horizon. Your GPS gives your current elevation as 1490 m , and according to the map, you're 25.0 km (horizontally) from the peak. Find the peak's elevation. I thought it would be 1490+...

*Wednesday, January 27, 2016 by lauren*

**Physics**

You have a neutral balloon. What is its charge after 12000 electrons have been removed from it? The elemental charge is 1.6 × 10−19 C. Answer in units of µC.

*Wednesday, January 27, 2016 by Ayo*

**analytical physics chemestry lab**

You are provided with a 0.5M solution of NaCl. You require a working solution of 0.004M. Describe how you would prepare this working solution, including all steps and calculations. Hint: You want to use the least amount of reagents and consumables, serial dilutions.

*Wednesday, January 27, 2016 by ruby*

**physics**

A force of 55 N at an angle of 32 degrees to the horizontal is applied to drag a 15kg box across a horizontal floor at a velocity of 2.5 m/s. The coefficient of friction between the box and the floor is 0.25 and the box is moved 15m across the floor. How much work is done by ...

*Wednesday, January 27, 2016 by Jan Dupre *

**Physics **

A 2700 kg car traveling to the north is slowed down uniformly from an initial velocity of 29.8 m/s by a 7540 N braking force acting opposite the car’s motion. a) What is the car’s velocity after 2.77 s? Answer in units of m/s.

*Wednesday, January 27, 2016 by Anonymous*

**Physics**

A proton and an alpha particle (q = +2.00e, m = 4.00u ) are fired directly toward each other from far away, each with an initial speed of 0.247c. What is their distance of closest approach, as measured between their centers? (Hint: There are two conserved quantities. Make use ...

*Wednesday, January 27, 2016 by Anonymous*

**Physics **

a spring extends by 10 cm when a mass of 100g is attached to it. what is the spring constant?

*Wednesday, January 27, 2016 by Rose *

**Physics**

A small rectangular ferry boat is 3.87 m wide and 5.81 m long. When a loaded truck pulls onto it, the boat sink an additional 4.31 cm into the river. What is the weight of the truck? The acceleration of gravity is 9.8 m/s^2. Answer in units of kN.

*Wednesday, January 27, 2016 by Luma*

**Physics**

A 1.8 kg rectangular air mattress is 2.46 m long, 1.23 m wide, and 0.189 m thick. What mass can it support in water before sinking? Answer in units of kg.

*Wednesday, January 27, 2016 by Luma*

**Physics**

A piece of metal weighs 51.8 N in air, 37.2 N in water, and 42.6 N in an unknown liquid. Find the density of the metal. Answer in units of kg/m^3 Find the density of the unknown liquid. Answer in units of kg/m^3

*Wednesday, January 27, 2016 by Luma*