Friday

October 31, 2014

October 31, 2014

Number of results: 36,508

**physics**

A worker stands still on a roof sloped at an angle of 23 above the horizontal. He is prevented from slipping by a static frictional force of 540 N. Find the mass of the worker.
*February 3, 2011 by Anonymous*

**physics**

worker stands still on a roof sloped at an angle of 30 above the horizontal. He is prevented from slipping by a static frictional force of 560 N. Find the mass of the worker.
*September 23, 2014 by chidera*

**physics**

A large building has an inclined roof. The length of the roof is 69.5 m and the angle of the roof is 18.0 below horizontal. A worker on the roof lets go of a hammer from the peak of the roof. Starting from rest, it slides down the entire length of the roof with a constant ...
*April 3, 2013 by Anonymous*

**Southern Union**

A large building has an inclined roof. The length of the roof is 64.0 m and the angle of the roof is 20.0 below horizontal. A worker on the roof lets go of a hammer from the peak of the roof. Starting from rest, it slides down the entire length of the roof with a constant ...
*February 8, 2014 by Mary Anne*

**physics**

a worker lays a rubber handled 0.500kg hammer down a sloped roof. it slides down the roof to a level portion of the roof where it slides another 2.oo m long this horizontal surface. the coefficient of friction between the rubber handle and the shingles is 0.850 a)draw free ...
*January 12, 2013 by teed*

**physices**

A man stands on the roof of a building of height 13.8 and throws a rock with a velocity of magnitude 29.3 at an angle of 34.8 above the horizontal. You can ignore air resistance
*April 8, 2011 by wala'a sami*

**Physics**

A man stands on the roof of a 19.0 m-tall building and throws a rock with a velocity of magnitude 24.0 m/s at an angle of 38.0 degrees above the horizontal. You can ignore air resistance. Calculate the maximum height above the roof reached by the rock. got it.... 11.1 m ...
*September 16, 2006 by Josh*

**physics**

A man stands on the roof of a 19.0 m-tall building and throws a rock with a velocity of magnitude 30.0 m/sat an angle of 42.0 degrees above the horizontal. You can ignore air resistance. Calculate the maximum height above the roof reached by the rock. Calculate the magnitude ...
*September 14, 2009 by lina*

**Physics**

A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 38.0 above the horizontal. You can ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock strikes ...
*February 6, 2008 by Ava*

**physics**

A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 34.0 above the horizontal. You can ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock strikes ...
*February 21, 2012 by Rei*

**physics**

A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 30.0 at an angle of 34.0 above the horizontal. You can ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock strikes ...
*February 21, 2012 by Rei*

**physics**

a man stands on the roof of a 15.0m tall building and throws a rock with a velocity of magnitude 30.0m/s at an angle of 33 degrees above the horizontal. ignoring resistance calculate the horizontal distance from the base of the building to the point where the rock strikes the ...
*June 27, 2014 by kristen*

**science**

A man stands on the roof of a building of height 15.8m and throws a rock with a velocity of magnitude 25.2m/s at an angle of 32.7∘ above the horizontal. You can ignore air resistance. Part A Calculate the maximum height above the roof reached by the rock. y = 9....
*March 2, 2014 by sanele*

**physics**

A man stands on the roof of a 19.0 m tall building and throws a rock with a velocity of magnitude 30.0 m/s at an angle of 30.0 degrees above the horizontal. Ignore air resistance. Calculate the horizontal distance from the base of the building to the point where the rock ...
*September 14, 2011 by Meghan*

**physics**

a man stands on the roof of a building that is 30m tall and throws a rock with a velocity of magnitude of 40m/s at an angle of 33 degress a bove the horizontal. Calculate the following: a.) The maximum height above the roof reached by the rock. b.) The magnitude of the ...
*February 7, 2013 by jm*

**Physics**

After delivering his toys in the usual manner, Santa decides to have some fun and slide down an icy roof. The roof is 7 m in length and makes an angle of 41 with the horizontal. He starts from rest at the top of the roof and accelerates at the rate of 3.9 m/s2. The edge of ...
*May 25, 2012 by Tina*

**Physics**

You lose your footing and slide of of your roof. Fortunately, you have placed a safety net whose center is positioned at a horizontal distance of 4.15m, measured from a point directly below the edge of the roof- and indeed you land in the center of the net. If the roof slopes ...
*October 19, 2009 by Bill*

**Physics`**

A field hockey player's arm and stick form a rigid segment. Assuming she hits the ball when the stick is vertical, which of the following would result in the greatest velocity of the end of her stick immediately before she hits the ball? a) She stands still and swings her arm/...
*November 25, 2013 by Caitlin*

**Physics**

A man stands on the roof of a building that is 50 m tall and throws a rock with a velocity of 35 m/s at an angle of 50 degrees above the horizontal (a) What is the total time in the air (b) What is the horizontal distance from the base of the building to the point where the ...
*December 18, 2013 by Vlad*

**Physics**

A man stands on the roof of a building that is 50 m tall and throws a rock with a velocity of 35 m/s at an angle of 50 degrees above the horizontal (a) What is the total time in the air (b) What is the horizontal distance from the base of the building to the point where the ...
*December 18, 2013 by Vlad*

**trigonometry**

A carpenter is building a house. He is constructing the roof. The roof has an angle of elevation of 40 from the horizontal. The height he wants to make the roof is 18 feet. How far is it from the bottom edge of the roof to the top of the roof? (Find the hypotenuse to the ...
*October 18, 2012 by rose*

**physics**

A 1.5 kg chunk of ice slides down a roof sloped at a 60 degree angle with the horizontal. If there is no friction, determine the acceleration of the ice. Show that the amount of mass doesn't matter in part a.
*October 26, 2010 by caroline*

**Physics**

A man stands on the roof of a 19.0 m-tall building and throws a rock with a velocity of magnitude 24.0 m/s at an angle of 38.0 degrees above the horizontal. You can ignore air resistance. Calculate the maximum height above the roof reached by the rock. Got it.... 11.1 m ...
*September 17, 2006 by Josh*

**Physics**

A baseball is hit with a speed of 27.0 m/s at an angle of 42.0 deg. It lands on the flat roof of a 10.0 m-tall nearby building. If the ball was hit when it was 1.0 m above the ground, what horizontal distance does it travel before it lands on the building...
*August 2, 2011 by Kyle*

**Physic**

A 29 kg board 3.2 m long is supported in a horizontal position at the two ends. A 77 kg worker stands 1.4 m from one end. What forces are exerted by the board on the two support points? Points closer to the worker. (Answer: 567N) Points farther from the worker. (Answer: 472N) ...
*May 14, 2014 by Anonymous*

**physics**

Consider four vectors F1, F2, F3, and F4, with magnitudes are F1 = 41 N, F2 = 24 N, F3 =27 N, and F4 = 51 N, and angle 1 = 150 deg, angle 2 = −160 deg, angle 3 = 39 deg, and angle 4 = −57 deg, measured from the positive x axis with the counter clockwise angular ...
*February 16, 2011 by anonymous*

**physics**

A man stands on the roof of a 10.0 -tall building and throws a rock with a velocity of magnitude 24.0 at an angle of 42.0 above the horizontal. You can ignore air resistance. Calculate the magnitude of the velocity of the rock just before it strikes the ground.
*February 2, 2008 by Ava*

**physics**

A ball is thrown up onto a roof, landing 4.50 s later at height h = 20.0 m above the release level. The ball's path just before landing is angled at θ = 54.0˚ with the roof. (a) Find the horizontal distance d it travels. What are the (b) magnitude and (c) angle (...
*February 23, 2011 by Bob*

**Physics**

a ball is thrown up onto a roof, landing 4.70 s later at height h = 24.0 m above the release level. The ball's path just before landing is angled at = 62.0 with the roof. (a) Find the horizontal distance d it travels. (Hint: One way is to reverse the motion, as if it is on ...
*September 13, 2010 by Antonio*

**Physics**

A building has a symmetric roof made from two straight sections at an angle of 20 above the horizontal. The sides are uniform and have a mass of m = 1800 kg. Find the magnitude of the horizontal force that this roof exerts at the top of the wall, pushing it outward. Before ...
*November 11, 2007 by Lou-Anne*

**PreCalc**

A contractor plans to build an artist's studio with a roof that slopes differently on the 2 sides. On one side, the roof makes an angle of 33 degrees with the horizontal. On the other side, which has a window, the roof makes an angle of 65 degrees with the horizontal. The ...
*January 3, 2011 by Neha*

**physics**

Q. A 200 kg load is suspended by a cable from a crane . Two ropes are attached to the load , acting at 90 deg to each other. One rope exerts a pull of 220 N , at 10 deg below horizontal, the other rope exerts a force of 360 N at 15 deg below horizontal. Calculate 1)tension in ...
*February 7, 2014 by john*

**physics**

A pair of vertical plane mirrors stands with an angle of β = 56.5 degrees between them. A pencil of light approaches in a direction parallel to one of them, as shown. After the pencil has left the mirrors, in which direction will it be going? (Give your answer as the ...
*September 14, 2013 by steph*

**physics**

The roof on a house rises 1.50 m over a horizontal diestance of 3.50 m. A 72.9-kg roofer stands on the roof. Is the frictional force that keeps the roofer from slipping equal in magnitude to F perpendicular or F paralell? What is its magnitude?
*December 7, 2009 by Corey*

**physics**

A boy throws a ball at 5.5 m/s at an angle of 25.4 above the horizontal off a cliff which is 70.8 m high. What angle does the velocity of the ball make with the horizontal 0.78 s after the throw? (make the angle positive if the angle is above the horizontal, and negative if ...
*December 6, 2012 by vince*

**Phys 2**

I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
*March 16, 2011 by Sonia*

**Physics**

I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
*March 16, 2011 by Sonia*

**physics**

A force of magnitude 25Nis directed at an angle of 37 deg above the horizontal moves a 10 Kg block along a horizontal surface at a constant velocity .How much work is done by this force in moaing the block a distance of 15m?
*July 16, 2010 by john*

**physical**

A biker rides on an upward-sloped road inclined at a 15.0 angle with the horizontal. If he moves at a constant speed of 2.0 meters/second for 60 seconds, what is the magnitude of his horizontal displacement?
*July 21, 2012 by Anonymous*

**physics**

A biker rides on an upward-sloped road inclined at a 15.0 angle with the horizontal. If he moves at a constant speed of 2.0 meters/second for 60 seconds, what is the magnitude of his horizontal displacement?
*May 20, 2013 by Anonymous*

**Physics**

Consider a piece of metal that is at 5 deg C. If it is heated until it has twice the internal energy, its temperature will be. a)556 deg C b)283 deg C c)273 deg C d)278 deg C e)10 deg C
*November 19, 2012 by S*

**math**

Take west to be the positive direction. The height of a sloped roof above the place where I stand is h = 12 feet (see the figure below). If I move 3 feet west, the height is 10 feet. If I move 2 additional feet west, what is the height of the roof above the place where I stand?
*April 5, 2014 by Jenna*

**Algebra 2**

A blue print of a shopping complex shows that the bottom edge of the roof to be 93 feet above the ground. If the roof rises to a point 171 feet above the ground over a horizontal distance of 6.5 yards, what is the slope of the roof? I am positive the answer is twelve, but the ...
*October 14, 2009 by Sunny*

**Please Please Help-Physics**

I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
*March 16, 2011 by Sonia*

**Physics**

A baseball is thrown from the roof of 23.5m -tall building with an initial velocity of magnitude 10.0m/s and directed at an angle of 53.1∘ above the horizontal. a.What is the speed of the ball just before it strikes the ground? Use energy methods and ignore air ...
*May 9, 2014 by Anonymous*

**physics**

Two masses are connected by a string. Mass A is on a flat roof and mass B is hanging over the edge of the roof. The mass on the roof is 15 kg and the hanging mass is 5 kg. The edge of the roof is 100 m above the ground. The two masses are initially at rest with the hanging ...
*November 18, 2010 by Anna*

**math**

A playground is on the flat roof of a city school, 5.8 m above the street below (see figure). The vertical wall of the building is h = 7.30 m high, to form a 1.5-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*February 14, 2012 by anonymous*

**HELP PHYSICS!!!!**

a worker pushes a 7kg shipping box along a roller track. assume friction is small enough to be ignored because of the rollers. the worker's push is 25 N directed down and to the right at an angle of 20 degrees. 1. determine the horizontal component of the worker's push 2. ...
*February 29, 2012 by C.*

**Physics**

A man stands on the roof of a 15m tall building and throws a rock with a velocity of magnitude 30m/s at an angle of 33deg above the horizontal. Ignore air resistance. Calculate: a) the maximum heigh above the roof reached by the rock b) the magnitude of the velocity of the ...
*September 27, 2011 by Kyle*

**HARD PHYSICS**

A playground is on the flat roof of a city school, 5.7 m above the street below (see figure). The vertical wall of the building is h = 7.10 m high, to form a 1.4-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*October 4, 2011 by Anonymous*

**college Physics I**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*January 29, 2010 by Katie*

**physics**

While a roofer is working on a roof that slants at 43.0 above the horizontal, he accidentally nudges his 88.0 toolbox, causing it to start sliding downward, starting from rest.If it starts 5.00 from the lower edge of the roof, how fast will the toolbox be moving just as it ...
*May 2, 2013 by Anonymous*

**physics**

a warehouse worker pulls on the handles of a 96.0 kg cart witha net force of 128N an angle of 55.0 degrees above the horizontal. Attached to the cart is a smaller cart having a mass of 72.0kg. What is the magnitude of the horizontal acceleration of the less massive cart?
*May 24, 2010 by julie *

**Physics**

My problem question: "A ball is thrown up onto a roof, landing 4.0 seconds later at a height of 20.0 m above where it was thrown. The ball's velocity vector upon landing on the roof top was angled 60 degrees to the horizontal flat roof top. Find the horizontal distance that ...
*October 7, 2010 by Thuy*

**PHYSICS HELP 3RD REQUEST**

A box rests on a plank that is inclined to the horizontal. As the angle between the plank and the horizontal increases, does the component of the weight of the box parallel to the plank increase, decrease, or remain the same? Please just answer Suzanne, you are going to have ...
*October 17, 2006 by Suzanne*

**Physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 42 ∘. The gravitational acceleration is g=10 m/s2 (a) At what ...
*October 6, 2013 by Anonymous*

**Geometry**

What is the value of x? image is on: tiny pic . com/r/nx1abn/8 I choose c 90 deg a 60 deg b 72 deg c 90 deg d 120 deg
*June 23, 2014 by Geo*

**physics**

While a roofer is working on a roof that slants 36 degrees above the horizontal, he accidentally nudges his 85.0 N toolbox, causing it to start sliding downward, starting from rest. If it starts 4.25m from the lower edge of the roof, how fast will the toolbox be moving just as...
*October 21, 2009 by steve*

**Physics**

A man stands on the roof of a 15m tall building and throws a rock with a velocity of magnitude 30m/s at an angle of 33deg above the horizontal. Ignore air resistance. Calculate: a) the maximum heigh above the roof reached by the rock b) the magnitude of the velocity of the ...
*September 26, 2011 by Kyle*

**physics**

A Man stands at the very top of the Sky Dump Stadium roof to pitch the opening ball for the Blew Jaws game. He slips a bit left of the centre and slides down along the frictionless roof surface as shown. For what vertical distance, measured from the ground, will he slide ...
*November 12, 2011 by Andy *

**pre-cal**

Find the EXACT VALUE of csc(-11pi/12) If that angle is in radians, it is easy. A full circle has 2PI radians...or 360 deg so 22PI/24 is the same as 22*15 deg, or -30 deg. The 30 deg triangle is well known. The sin is 1/2, so the csc is 2 Figure out the sign of the csc from ...
*May 16, 2007 by ethan*

**two dimensional kinematics**

A hammer slides down a roof of angle theta (with respect to the ground). It slides along the roof distance D. As it leaves the roof, a height H above the ground, it has velocity in both directions. Find how far from the base of the building the hammer lands.
*October 8, 2012 by ringo*

**Physics**

A hammer slides down a roof that makes a 40.0 degree angle with the horizontal. What are the magnitudes of the components of the hammer's velocity at the edge of the roof if it is moving at a speed of 4.25m/s?
*November 17, 2011 by Wilson*

**URGENT**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 37 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 5, 2013 by kyle*

**Physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 5, 2013 by sonia*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 5, 2013 by kyle*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 5, 2013 by anon*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 5, 2013 by HELP!!!!*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 45 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by kyle(PLS HELP )*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by anon*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by anon*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by HELP(ANS PLS!!!!!!!!)*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by URGENT(could some one pls give me the answer*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by URGENT(could some one pls give me the answer*

**physics(help)**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by physics(help)*

**PHYSICS**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by PHYSICS*

**physics**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by PHYSICS*

**physics(*URGENT*)**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 6, 2013 by Anonymous*

**math**

A construction worker on the roof of a 17 meter building in NYC is speaking to his boss on the ground. If the boss is standing 9 meters from the building, from the angle of depression from the construction worker to his boss. I used the formula Tan=o/a tan x= 17/9 so I got 63 ...
*March 3, 2014 by B8*

**College Physics**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.50 m high, forming a 1.3-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*February 1, 2010 by Katie*

**Physics**

A student stands at the edge of a cliff and throws a stone horizontally over the edge with a speed of 15.0 m/s. The cliff is h = 66.0 m above a flat horizontal beach. How long after being released does the stone strike the beach below the cliff? I got 3.67 s. With what speed ...
*June 1, 2008 by Elisa*

**physics (it's rather urgent help is appreciated**

We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
*October 5, 2013 by anon*

**physics**

A worker can supply a maximum pull of 150 lbs. on a cart which has a handle set an angle of 40degree above the horizontal. what is the coefficient of friction if he can just move a total load of 1500lbs. ?
*February 3, 2013 by glindyll*

**Physics**

In the annual battle of the dorms, students gather on the roofs of Jackson and Walton dorms to launch water balloons at each other with slingshots. The horizontal distance between the buildings is 40.0 m, and the heights of the Jackson and Walton buildings are, respectively, ...
*February 16, 2014 by Billy*

**Physics**

A baseball is thrown from the roof of a 22.3 m tall building with an initial velocity of 13.1 m/s and is directed 50.9 degrees above the horizontal. A)What is the speed of the ball just before it strikes the ground? B)What is the answer for part A) if the initial velocity was ...
*March 13, 2012 by Kelsey*

**physics**

A container of hot water at 80 deg C cools to 79 deg C in 15 seconds when it is placed in a room that is at 20 deg C. Use Newton's law of cooling to estimate the time it will take for the container to cool from 70 deg C to 69 deg C.
*October 19, 2011 by Dave*

**physics**

A container of hot water at 80 deg C cools to 79 deg C in 15 seconds when it is placed in a room that is at 20 deg C. Use Newtons law of cooling to estimate the time it will take for the container to cool from 70 deg C to 69 deg C.
*October 19, 2011 by Dave*

**Algebra**

Take west to be the positive direction. The height of a sloped roof above the place where I stand is h = 18 feet (see the figure below). If I move x = 5 feet west, the height is 10 feet. What is the slope?
*October 1, 2011 by Lori*

**PHYSICS **

A worker pulls a 200-N packing crate at constant velocity across a rough floor by exerting a force F = 55.0 N at an angle of 35.0 degrees above the horizontal. What is the coefficient of kinetic friction of the floor?
*October 3, 2013 by Meme*

**Physics**

A playground is on the flat roof of a city school, 5.2 m above the street below (see figure). The vertical wall of the building is h = 6.70 m high, forming a 1.5-m-high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching...
*September 14, 2011 by Lauryn*

**physics**

Frank stands at the base of a building. He throws a 0.12kg rock straight up at a speed of 28m/s so that it rises to a maximum height of 12m above the top of the building and then falls straight down on the roof of the building. a) What is the height of the building? b) What is...
*April 18, 2010 by bob*

**Physics Gr.11**

Frank stands at the base of a building. He throws a 0.12kg rock straight up at a speed of 28m/s so that it rises to a maximum height of 12m above the top of the building and then falls straight down on the roof of the building. a) What is the height of the building? b) What is...
*April 18, 2010 by NINI*

**Adams**

Sorry I am completly lost on this one and it is my last homework problem. Due in a couple of hours if someone could help. I would greatly appreciate it. A block is placed on an inclined plane. The acceleration of gravity is 9.8 m/s^2. What force is required to push the block ...
*September 26, 2012 by Carrie*

**Physics**

Sorry I am completly lost on this one and it is my last homework problem. Due in a couple of hours if someone could help. I would greatly appreciate it. A block is placed on an inclined plane. The acceleration of gravity is 9.8 m/s^2. What force is required to push the block ...
*September 26, 2012 by Carrie*

**science (physics) Need to solve this today please**

(a) Express the vectors A, B, and C in the figure below in terms of unit vectors. (b) Use unit vector notation to find the vectors R = A + B + C and S = C A B. (c) What are the magnitude and directions of vectors R and S? Well the picture goes and has a vector A pointing ...
*September 29, 2007 by ~christina~*

**physics**

an object slides off a roof 10 m above the ground with an initial horizontal speed of 5 m per second. the time between the object's leaving the roof and hitting the ground is 1.4s. how far does it land from the wall?
*October 1, 2011 by Serena*

**Physics**

A playground is on the flat roof of a city school, 7.00 m above the street below. The vertical wall of the building is 8.00 m high, forming a 1.00 m high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle...
*October 15, 2009 by Chloe*

**physics**

the roof on a house rises 1 .00 m over a horizontal distance of 3.5 m. a 71 kg roofer stands on the roof. is the frictional force that keeps the roofer from slipping equal in magnitude to fparallel or fperpendicular? what is the magnitude of this force? I'm pretty sure its ...
*November 28, 2011 by inclined plane*

**Science**

A 110.0 kg box is pushed by a horizontal force F at constant speed up a frictionless ramp which makes an angle of 35.0 deg with the horizontal. Find the magnitude of the applied force F.
*October 26, 2011 by Mark*

**physics**

A cable is lifting a construction worker and a crate The weights of the worker and crate are 915 and 1430 N, respectively. The acceleration of the cable is 0.620 m/s2, upward. what is the tension in the cable below the worker? what is it above the worker?
*December 4, 2010 by hy*

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