Wednesday

October 26, 2016
Number of results: 16,540

**Physics**

A ball is thrown at an angle of 37.1degrees above the horizontal from a point on the top of a building and 60m from the edge of the building. It just misses the edge of the building and continues on towards the ground. The building is 50m high. At what speed was the ball ...

*March 13, 2008 by Anonymous*

**AP Physics**

Three blocks of masses 8.2 kg, 5.88 kg, and 2.19 kg are connected by light strings that pass over frictionless pulleys as shown in the ﬁgure. The acceleration of the 5.88 kg block is 2.18 m/s 2 to the left and the surfaces are rough. The acceleration of gravity is 9.8 m...

*February 5, 2012 by .*

**PHYSICS**

A baseball is thrown with an initial velocity of magnitude v at an angle of 21.8 with respect to the horizontal (x) direction. At the same time, a second ball is thrown with the same initial speed at a different angle A with respect to x. If the two balls land at the same spot...

*February 4, 2011 by Renee*

**Math**

A ball is thrown straight up from a bridge over a river and falls into the water. The height, h, in meters, of the ball above the water t seconds after being thrown is approximately modeled by the relation h=-5t^2+10t+35. c) After how many seconds does the ball hit the water?

*November 3, 2014 by Alex*

**physics**

an 8g bullet is shot into a 4kg block, at rest on a frictionless surface. the bullet remains lodged in the block. the block moves into a spring and compresses it 9.40cm. the force constant of the spring is 1000 N/m. a) what is the initial velocity of the bullet b) how much ...

*July 22, 2011 by Anonymous*

**Physics**

A girl riding a bicycle at 2.16 m/s throws a tennis ball horizontally forward at a speed of 1.38 m/s relative to herself. The tennis ball lands 1.84 m horizontally from the point at which the girl released the ball. How high above the ground was the ball released?

*November 13, 2012 by Asia*

**Physics **

A ball is thrown vertically upward with an initial speed of 11 m/s . Then, 0.67 s later, a stone is thrown straight up (from the same initial height as the ball) with an initial speed of 25 m/s . How far above the release point will the ball and stone pass each other? The ...

*September 30, 2014 by Linda*

**physics**

A ball is thrown vertically upward with an initial speed of 25 m/s. Then, 1.8 s later, a stone is thrown straight up (from the same initial height as the ball) with an initial speed of 32.1 m/s . How far above the release point will the ball and stone pass each other? The ...

*February 8, 2016 by Mariana*

**physics- multiple choice**

1. Two forces are applied to a box on a frictionless surface. One force is 40 N [S]. The second force is 70 N [N30ºW]. What is the overall net force? a) 40.6 N [S59.5ºE] b) 110 N c) 40.6 N [N59.5ºW] d) 40.6 N [S30.5ºW] 2. When drawing free body diagrapms, it is important to: a...

*December 12, 2013 by Jessie*

**science**

A box with a weight of 100N rests on l horizontal floor .

*February 18, 2015 by anovuyo*

**Physics**

A stone is thrown vertically upward at a speed of 27.00 m/s at time t=0. A second stone is thrown upward with the same speed 2.060 seconds later. At what time are the two stones at the same height?

*September 18, 2014 by Jake*

**physics**

A stone thrown upward at the top of the tower reaches the ground after 5 sec. A second stone is thrown down with the same speed and reaches ground in 3 sec. What is the height of the tower

*July 14, 2016 by sai*

**physics**

Last two problems on the homework! please help with these 2. it helps when detailed explanations are given! thanks A 2 kg ball is thrown horizontally, at 5m/s, from a height of 5 m. How fast will it be moving when it contacts the ground? A 70 kg pole-vaulter converts the ...

*June 29, 2015 by 1*

**Math ASAP**

Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: 400 square inches (^^^this is the total surface area of the sides) What is the Surface Area of the triangular prism?

*August 26, 2013 by Omar*

**Science**

If you know the temperature (T) and dew point (Td) of an air parcel at the surface, you can calculate the LCL using the following equation. LCL=125m x (T-Td). Calculate the LCL: Parcel A Parcel B surface temperature 30 degrees C 30 degrees C Surface dew point 20 degrees C 10 ...

*March 10, 2009 by Mentos*

**Physics**

HELP PLEASE. Hypothetically, you are standing on the balcony of an apartment on the 10th level of a building and you throw a ball at some angle, 0 , above the horizontal away from the building. the ball lands on the ground 10m from the building, 3.2s after it was thrown. the ...

*April 26, 2012 by Melissa*

**Physics**

An object of mass M = 884 g lies on a table. It is free to move along a horizontal, frictionless surface. This object is connected to a second object that hangs along the slide of the table by a massless string that runs over a pulley and connects both masses. This object has ...

*October 14, 2009 by Nala*

**chemistry**

a 0.0500 mol sample of a nutrient substance is burned in a bomb calorimeter containing 2.00 x 10^2g H2O. If the formula weight of this nutrient substance is 114g/mol, what is the fuel value (in nutrient Cal) if the temperature of the water increased 5.70C

*April 15, 2014 by ana*

**chemistry**

A flask containing 200 mL of solution is labeled 0.300 M CuBr2. A sample containing 0.0500 moles of Br− is added to the solution. What is the molarity of the Br− ion solution? Assume no volume change. a) 0.850 M b) 0.667 M c) 1.10 M d) 1.00 M e) 0.400 M

*January 11, 2016 by bilawal*

**Analytical Chemistry**

Need help with question. Calculate the pH of a buffer prepared by adding 100mL of 0.0500M NaOH to 100mL of 0.175M CH3COOH. so far I have calculated mols of CH3COOH---->H+ + CH3OO- CH3COOH=0.1L*0.175mol/1L=0.0175mol OH-=0.1L*0.0500/1L=0.00500mol Not sure were to go from here...

*October 15, 2011 by Caral*

**physics**

A block of mass M = 6.755 kg is pulled along a horizontal frictionless surface by a rope of mass m = 0.592 kg, as shown in Fig. 5-63. A horizontal force = 41.5 N is applied to one end of the rope. Assume that the rope only sags a negligible amount. Find (a) the acceleration of...

*February 26, 2012 by zach*

**physics**

Eris, the largest dwarf planet known in the Solar System, has a radius R = 1200 km and an acceleration due to gravity on its surface of magnitude g = 0.77 m/s2. (a) Use these numbers to calculate the escape speed from the surface of Eris. 1360 m/s correct answer. (b) If an ...

*October 30, 2011 by mymi*

**Physics**

Block B in the figure(Figure 1) rests on a surface for which the static and kinetic coefficients of friction are 0.65 and 0.40, respectively. The ropes are massless.What is the maximum mass of block A for which the system is in equilibrium? (Consider the state of the system ...

*October 10, 2014 by Dib*

**physics**

A .50kg ball is rolling on a frictionless surface at a speed of .75m/s. it collides with a second ball with a mass of 1kg which is also moving in the same direction as the first ball with a speed of .38m/s. After the collision the firt ball continues at a reduced speed of .35m...

*March 26, 2011 by Mari*

**math(again)**

the ? says "a cone has the surface area of 160 sq. in. If the dimensions are reduced by 1/2,what is the surface area of the new cone?" i just cant seem to find the formula for the surface area of the cone.

*January 5, 2009 by brianna*

**physics**

As shown in the figure below, a 2.25-kg block is released from rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 15.0 cm that ...

*November 30, 2012 by Diego*

**Physics**

As shown in the figure below, a 2.25-kg block is released from rest on a ramp of height h. When the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 15.0 cm that ...

*July 11, 2016 by Brionna*

**physics**

a boy on a small hill aims his water ballon slingshot horizontally straight horizontally at a second boy hanging from a branch of a tree at a distance of d away . at the instant ballon is released the second boy let go and fall off froom tree to aviod eing hit will his plan ...

*February 17, 2012 by Anonymous*

**Physics**

Two steel blocks are at rest on a frictionless horizontal surface. Block X has a mas of 3.0 kg ans is attacthed by means of a light taut string to block Y that has a mass of 12 kg. A force of 45 N (E) is applied to block x. Calculate the force block Y exerts on block x. I don'...

*April 17, 2009 by Lena*

**physics**

A ball is thrown from the top of a building upward at an angle of 66 ◦ to the horizontal and with an initial speed of 16 m/s. The ball is thrown at a height of 53 m above the ground and hits the ground 33.2074 m from the base of the building. The acceleration of gravity ...

*November 8, 2009 by Anonymous*

**Physics**

Block A sits on a horizontal tabletop. There is friction between the surface and Block A. The string passes over a frictionless, massless pulley. Block B hangs down vertically. When the two blocks are released, Block B accelerates downward at a rate of 2.030 m/s2. What is the ...

*February 18, 2016 by Emily*

**Physics**

A 1.6kg box that is sliding on a frictionless surface with a speed of 11m/s approaches a horizontal spring. The spring has a spring constant of 2000 N/m. a. How far will the spring be compressed in stopping the box? b. How far will the spring be compressed when the box's speed...

*November 26, 2010 by Erin*

**Physics**

A 1.4 kg box that is sliding on a frictionless surface with a speed of 10 m/s approaches a horizontal spring. The spring has a spring constant of 2000 N/m. (a) How far will the spring be compressed in stopping the box? (b) How far will the spring be compressed when the box's ...

*April 10, 2016 by michael*

**Physics**

a bowling ball is thrown down from the top of a building at 20 m/s. Find the distance the ball travels in A) 1 s B) 3 s should I make the 20 m/s negative? I'm assuming the ball is just being thrown stright down... I'm using the formula d=V(initial)*t+1/2a*t^2 I'm getting -24.9...

*February 3, 2009 by Bex*

**physics**

Two blocks of masses m1 = 4.00 kg and m2 = 3.00 kg are placed in contact with each other on a frictionless horizontal surface. A constant force F = 9.00 N is applied to the block of mass m1. a) Determine the magnitude of the acceleration of the two-block system. b) Determine ...

*February 11, 2012 by michael*

**Physics**

Two rollerbladers throw a frisbie back and forth on a frictionless surface. Which does not change? a. Momentum of an individual rollerblader b. Momentum of the frisbie c. Momentum of the system consisting of the frisbie and rollerbladers throwing the ball d. Momentum of the ...

*April 12, 2009 by Jacob*

**college Physics**

Two identical 0.18 kg blocks (labeled 1 and 2) are initially at rest on a nearly frictionless surface, connected by an unstretched spring, as shown in the upper diagram, where x2 = 0.06 m. Then a constant force of 9 N to the right is applied to block 2, and at a later time the...

*October 26, 2010 by Anonymous*

**PHYSİCS I**

A mass m1 = 18.7 kg on a frictionless ramp is attached to a light string. The string passes over a frictionless pulley and is attached to a hanging mass m2. The ramp is at an angle of θ = 23.7° above the horizontal. m1 moves up the ramp uniformly (at constant speed). Find...

*March 1, 2012 by ADRİAANA*

**physics**

A mass m1 = 18.7 kg on a frictionless ramp is attached to a light string. The string passes over a frictionless pulley and is attached to a hanging mass m2. The ramp is at an angle of θ = 23.7° above the horizontal. m1 moves up the ramp uniformly (at constant speed). Find...

*March 2, 2012 by lissa*

**Physics**

Eris, the largest dwarf planet known in the Solar System, has a radius R = 1200 km and an acceleration due to gravity on its surface of magnitude g = 0.77 m/s2. (a) Use these numbers to calculate the escape speed from the surface of Eris. (b) If an object is fired directly ...

*June 28, 2012 by Anna*

**Physics **

two forces act concurrently on a 5kg block resting on a smooth horizontal surface a 5N force making a 40degree angle with the surface and a 10n making a 20degree angle with the surface. A) Determine the magnitude and direction of the net force acting on a box.

*July 18, 2011 by Edward*

**Physics**

Just before landing on mars, a spaceshuttle turns on its retroengine and eventually comes to a complete stop 15 meters above the planets surface. It then drops freely down to the surface. How long does it take to fall to the surface.What is the impact speed? Is the answer 1.5 ...

*January 11, 2009 by Chloe*

**Physics**

Just before landing on mars, a spaceshuttle turns on its retroengine and eventually comes to a complete stop 15 meters above the planets surface. It then drops freely down to the surface. How long does it take to fall to the surface.What is the impact speed? Is the answer 1.5 ...

*January 11, 2009 by Chloe*

**Meteorology**

I have a skew t diagram and I need help with the following Temperature at the surface: Dewpoint at the surface: Winds near the surface: Temperature at 700 mb: Dewpoint at 700 mb:

*February 11, 2012 by Jessenia*

**Chemistry**

A 1.50 L buffer solution is 0.250 mol L-1 in HF and 0.250 mol L-1 in NaF. Calculate the pH of the solution after the addition of 0.0500 moles of solid NaOH. Assume no volume change upon the addition of the base. The Ka for HF is 3.5 × 10-4. Thanks in advance!

*June 21, 2015 by B*

**General Physics**

A 4 kg block slides along a frictionless horizontal with a speed of 5.1 m/s. After sliding a distance of 7 m, the block makes a smooth transition to a frictionless ramp inclined at an angle of 13 degrees to the horizontal. The acceleration of gravity is 9.81 m/s2. How far up ...

*July 26, 2013 by Charles*

**Physics**

A 0.30 kg puck, initially at rest on a frictionless horizontal surface, is struck by a 0.20 kg puck that is initially moving along the x axis with a velocity of 2.8 m/s. After the collision, the 0.20 kg puck has a speed of 0.5 m/s at an angle of θ = 53° to the positive x ...

*October 23, 2011 by Seth*

**Physics**

Suppose a straight 1.25 mm diameter copper wire could just "float" horizontally in air because of the force of the Earth's magnetic field B, which is horizontal, perpendicular to the wire, and of magnitude 5.00 multiplied by 10-5 T. What current would the wire carry? I want to...

*February 10, 2011 by Justin*

**Physics**

A block of mass m1 = 6.25 kg on a frictionless plane inclined at angle θ = 30.7° is connected by a cord over a massless, frictionless pulley to a second block of mass m2 = 2.36 kg hanging vertically (Fig. 5-52). (a) What is the acceleration of the hanging block (choose ...

*October 16, 2011 by Ty*

**Chemistry**

A sample of krypton gas occupies 95.0 mL at 0.500 atm. If the temperature remained constant, what volume would the krypton occupy at (a) 5.00 atm, (b) 0.0500 atm, (c) 555 torr, (d) 5.00 torr, and (e) 5.5 3 1022 torr?

*April 28, 2015 by Alicia*

**PHYSICS**

A bucket containing cement has a mass of 3kg. One end of a rope is attached to the handle of the bucket and the other end is wound around a horizontally mounted cylinder on frictionless bearings. The mass of cylinder is 6kg and its radius is 0.10m. The moment of inertia of the...

*August 24, 2016 by Sarah*

**Physics**

Select the motion diagram that corresponds to each of the four situations. E.g., if diag. A corresponds to the first situation, diag. C to the second, and none of the diagrams to situations 3 and 4, enter ACNN. Note that the velocity and acceleration vectors are shown; both ...

*September 29, 2015 by Michael *

**Physics**

At a certain instant, a ball is thrown downward with a velocity of 8.0 m/s from a height of 40 m. At the same instant, another ball is thrown upward from ground level directly in line with the first ball with a velocity of 12 m/s. Find (a) the time when the balls collide and (...

*February 26, 2013 by Dan*

**math**

ball is thrown up at 88 ft/s from a height of 25 feet. Path of ball is y = -16t^2 + 88t +25. y is the height of ball above the ground t seconds after being thrown. when does it reach maxiumum height? (I got that at 2.75 s) At what time does the ball hit the ground? (I set ...

*October 16, 2011 by BJ*

**physics**

A 27-kg boy stands 4 m from the center of a frictionless playground merry-go-round, which has a moment of inertia of 238 kg m2. The boy begins to run in a circular path with a speed of 0.6 m/s relative to the ground. (a) Calculate the angular velocity of the merry-go-round. (b...

*March 26, 2011 by Nick*

**physics**

A 27-kg boy stands 4 m from the center of a frictionless playground merry-go-round, which has a moment of inertia of 238 kg m2. The boy begins to run in a circular path with a speed of 0.6 m/s relative to the ground. (a) Calculate the angular velocity of the merry-go-round. (...

*March 26, 2011 by Really stuck in this problem !!*

**Physics**

A bowling ball of mass M and radius R is thrown along a level surface so that initially ( t= 0) it slides with a linear speed but does not rotate, see the figure. As it slides, it begins to spin, and eventually rolls without slipping. How far has the ball moved down the lane ...

*December 4, 2011 by Helen*

**Physics**

A bowling ball of mass M and radius R is thrown along a level surface so that initially ( t= 0) it slides with a linear speed but does not rotate, see the figure. As it slides, it begins to spin, and eventually rolls without slipping. How far has the ball moved down the lane ...

*December 4, 2011 by Helen*

**Advanced Physic**

An 8.5 m extension ladder of mass 24 kg is propped up against a wall, touching at a point 8.0 m above the level ground. A man of mass 75 kg climbs 2.0 m up the ladder to repair a window. The ladder rests against a frictionless wall, but the ground has friction. Determine the ...

*May 14, 2014 by Anonymous*

**Physics**

Suppose you’re eating in yet another restaurant where the dishes are shared at the table and all placed uniformly on a rotating disk-like surface. Model this surface as a thin disk of radius 30 cm. Someone else has spun the surface, such that it is initially at an angular ...

*April 22, 2016 by Santhiya *

**Physics**

A 23-kg boy stands 3 m from the center of a frictionless playground merry-go-round, which has a moment of inertia of 180 kg m2. The boy begins to run in a circular path with a speed of 0.6 m/s relative to the ground. (a) Calculate the angular velocity of the merry-go-round in ...

*June 18, 2012 by Maria*

**Physics**

A ball is thrown straight up from the ground with speed . At the same instant, a second ball is dropped from rest from a height , directly above the point where the first ball was thrown upward. There is no air resistance. Question- Find the value of in terms of and so that at...

*May 28, 2010 by Anonymous*

**Calculus**

A mass on a spring vibrates horizontally on a smooth level surface (see the figure). Its equation of motion is x(t) = 8 sin t, where t is in seconds and x is in centimeters. The first part of the question is to find the velocity and acceleration equations, which I got to be: v...

*October 6, 2015 by kelly*

**physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.86 m. The stones are thrown with the same speed of 9.78 m/s. Find the location (above the base of the ...

*December 13, 2011 by chris*

**physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.97 m. The stones are thrown with the same speed of 8.50 m/s. Find the location (above the base of the ...

*September 5, 2012 by Tracie *

**Physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.82 m. The stones are thrown with the same speed of 9.83 m/s. Find the location (above the base of the ...

*September 30, 2012 by Bryan*

**physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.16 m. The stones are thrown with the same speed of 8.67 m/s. Find the location (above the base of the ...

*September 21, 2013 by Jay*

**physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.16 m. The stones are thrown with the same speed of 8.67 m/s. Find the location (above the base of the ...

*September 22, 2013 by I need help soon!!*

**Physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.02 m. The stones are thrown with the same speed of 9.20 m/s. Find the location (above the base of the ...

*September 13, 2014 by Brandon *

**physics**

A mass is thrown upward towards a vertical wall. If the release point is at a horizontal distance of 12 meters from the base of the wall, and the ball is launched at an angle of 60 degrees above the horizontal, with what speed need it be thrown so that it strikes the wall 10 ...

*September 21, 2014 by Victor*

**physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 5.28 m. The stones are thrown with the same speed of 9.33 m/s. Find the location (above the base of the ...

*March 25, 2015 by Anonymous*

**Physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.34 m. The stones are thrown with the same speed of 9.35 m/s. Find the location (above the base of the ...

*September 20, 2015 by Hannah*

**Physics **

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.41 m. The stones are thrown with the same speed of 8.35 m/s. Find the location (above the base of the ...

*October 1, 2015 by bob*

**american government**

In a dictatorship supreme authority rests solely with the people

*September 22, 2008 by cher taregan*

**Calculus**

Suppose that the region between the x-axis and the curve y=e^-x for x>=0 has been revolved around the x-axis. Find the surface area of the solid. I got 3*pi The book shows an answer of pi * [sqrt(2) + ln(1 + sqrt(2))] Where do I go wrong? For the sides of the surface, I ...

*January 13, 2008 by mathstudent*

**Math ASAP**

Height: 10 inches Base Perimeter: 40 inches Lateral Surface Area: 400 square inches (^^^this is the total surface area of the sides) What is the Surface Area of the triangular prism? (the picture of the shape looks like a pentagon but the rectangle is much longer)

*August 26, 2013 by Omar*

**Physics**

Two objects are connected by a light string that passes over a frictionless pulley as in the fi gure. One object lies on a frictionless, smooth incline. In the figure, m1 = 8.48 kg, m2 = 4.84 kg, and theta = 40.2 degrees . When we let go of the mass m1, it accelerates ...

*January 27, 2013 by Lindsey*

**Physics**

Three blocks on a frictionless horizontal surface are in contact with each other, as shown below. A force F is applied to block A (mass mA). (a) Draw a free-body diagram for each block. Determine (b) the acceleration of the system (in terms of mA, mB, mC), (c) the net force on...

*October 22, 2010 by Anonymous*

**Calc**

"Consider the surface given by 4x^2-y^2+5z^2-10z=55. a) Find all points on the surface at which the tangent plane is parallel to the plane 8x+y+15z=1. b) Pick one of these points and give the equation of the tangent plane to the surface at that point." Could someone help me ...

*March 1, 2011 by Anonymous*

**physics**

acceleration due to gravity questions when an object is dropped from a height of 10m above the surface of the planet z, it takes 1.2 seconds for the object to reach the surface. what is the acceleration of a falling object near the surface of the planet?

*February 25, 2010 by jake*

**physics**

In the problem, please assume the free-fall acceleration g = 9.80 m/s2 unless a more precise value is given in the problem statement. Ignore air resistance. A stone is thrown vertically downward from the roof of a building. It passes a window 15.0 m below the roof with a speed...

*September 4, 2012 by kevin*

**uni physics **

A balloon of radius 30.0 cm is sprayed with a metallic coating so that the surface is conducting. A charge of 8.85×10−8 C is placed on the surface. What is the potential on the balloon's surface? 2.65×10^3 V Suppose that the some air is let out of the balloon, so that ...

*September 25, 2013 by Aman*

**physics**

A ball thrown straight upward returns to its original level in 2.50s. A second ball is thrown at an angle of 36.degrees above the horizontal. What is the initial speed of the second ball if it also returns to its original level in 2.50

*September 17, 2011 by elisa*

**physics - electric fields**

A 2.00 square meter flat surface is placed in a uniform electric field of magnitude 6.00 N/C. If the surface is oriented so that the field lines are all parallel to the surface, find the magnitude of the electric flux through this area

*September 8, 2013 by Lakitha*

**physics**

a ball is thrown up and reaches a maximum height of 5 m. a) what is the initial velocity of the ball? b) how long does it take for the ball to reach its maximum height? c) what is the final velocity of the ball? if i returns to where it was thrown from?

*November 29, 2012 by Isis*

**Chemistry**

Sodium sulfate is slowly added to a solution containing 0.0500 M Ca^2+ (aq) and 0.0390 M Ag^+ (aq). What will be the concentration of Ca^2+ (aq) when Ag2SO4(s) begins to precipitate? What percentage of the Ca^2+ (aq) can be separated from the Ag^+ (aq) by selective ...

*March 17, 2013 by Anon*

**Physics**

A hockey puck of mass 0.16 kg, sliding on a nearly frictionless surface of ice with a velocity of 2.0 m/s (E), strikes a second puck at rest with a mass of 0.17 kg. the first puck has a velocity of 1.5 (N 31 E) after the collision. Determine the velocity of the second puck ...

*November 18, 2013 by Priyank*

**Physics**

The electric flux through the surface shown in Figure Ex27.10 is 15.0 Nm2/C, and the electric field makes an angle α = 70° with the surface. What is the electric field strength? The surface is a 10cm by 10cm square.

*September 13, 2010 by David D.*

**physics**

A block of mass m1 = 3.56 kg on a frictionless plane inclined at angle θ = 34.1° is connected by a cord over a massless, frictionless pulley to a second block of mass m2 = 2.72 kg hanging vertically (see the figure). (a) What is the acceleration of the hanging block (...

*March 17, 2016 by krals*

**Physics **

A 0.2 kg baseball located at the top of a building which is 100 m above the ground is thrown with an initial velocity 30 m/s at an angle of 30o above the horizontal. (a) Determine the total energy which the ball will have just after the instant that the ball is thrown. (b) ...

*June 24, 2012 by Aria*

**physics**

A 1.82 kg box moves back and forth on a horizontal frictionless surface between two different springs, as shown. The box is initially pressed against the stronger spring (k1 = 37.0 N/cm), compressing it 3.10 cm, and then is released from rest. By how much will the box compress...

*October 27, 2007 by Megan*

**Physics**

A mass of 2.2kg is placed on a stiff vertical spring which has a spring constant of 950n/m. The object is then pressed against the spring until it has been compressed a distance of 77cm. The mass is then released and is allowed to be thrown up into the air. How high in the ...

*February 25, 2012 by Rob*

**Physics**

Two stones are thrown simultaneously, one straight upward from the base of a cliff and the other straight downward from the top of the cliff. The height of the cliff is 6.80 m. The stones are thrown with the same speed of 9.05 m/s. Find the location (above the base of the ...

*October 1, 2012 by Jackie Li*

**physics**

Two toboggans are pulled across the ice with a force of 1.2 x 102 N. The rope of the toboggan makes an angle of 55o with the horizontal. The first toboggan has a mass of 25 kg, and the second toboggan has a mass of 16 kg. Assume that the ice surface is smooth enough to be ...

*April 25, 2012 by myra*

**physics**

Consider an ideal spring that has an unstretched length l0 = 3.9 m. Assume the spring has a constant k = 20 N/m. Suppose the spring is attached to a mass m = 6 kg that lies on a horizontal frictionless surface. The spring-mass system is compressed a distance of x0 = 1.7 m from...

*October 11, 2013 by PLS HELP*

**Calculus**

a rectangular box of given volume is to be "a" times long as it is wide. find the dimension for which it has the least total surface area ? L= aw Total surface area= 2LW + 2Lh + 2Wh = 2aw^2 + 2awh + 2wh But volume= lwh= 2aw^2 h or h= V/2aw^2 Total Surface area= = 2aw^2 + 2awV/...

*December 10, 2006 by Hero*

**Kinetic energy**

steel ball of mass 0.310 kg is fastened to a cord that is 86.0 cm long and fixed at the far end. The ball is then released when the cord is horizontal, as shown in the figure. At the bottom of its path, the ball strikes a 3.10 kg steel block initially at rest on a ...

*April 26, 2015 by Anonymous*

**physics**

A box containing food supplies for a refugee camp was dropped from a helicopter flying horizontally at a constant elevation of 414.1 m. If the box hit the ground at a distance of 95.3 m horizontally from the point of its release, ... a) what was the speed of the helicopter? b...

*October 16, 2015 by sandy*

**Physics - Mechanics**

A small block of mass 1.2 kg is launched by a compressed spring with force constant k=600 N/m. The initial compression of the spring is 0.15 m. The block slides along a horizontal frictionless surface and then up an inclined plane that makes an angle θ=40˚ with the ...

*March 13, 2015 by Anonymous*

**Physics - Mechanics**

A small block of mass 1.2 kg is launched by a compressed spring with force constant k=600 N/m. The initial compression of the spring is 0.15 m. The block slides along a horizontal frictionless surface and then up an inclined plane that makes an angle θ=40˚ with the ...

*March 14, 2015 by Anonymous*