# A block weighing 70.7 N rests on a plane inclined at 21.6° to the horizontal. The coefficient of the static and kinetic frictions are 0.23 and 0.12 respectively. What is the minimum magnitude of the force F, parallel to the

22,562 questions, page 154-
## Science

When a car is driving forward on a horizontal road what is the direction of the frictional force on the tires?? The answer is forward on all tires, but how is this correct?

*asked by Anonymous on October 29, 2017* -
## Physics

A uniform rod is 4m long and weighs 10 kg.if it is supported on a knife edge at one metre from the end what weight placed at that end keeps the rod horizontal?

*asked by priya on December 11, 2015* -
## physics

A stone is thrown horizontally from a cliff 25m high and lands on the ground 22 m from the foot of the cliff. What is the horizontal acceleration on the stone?

*asked by chelsea on September 28, 2011* -
## physics

A brick is thrown upward from the top of a building at an angle of 10° to the horizontal and with an initial speed of 11 m/s. If the brick is in flight for 2.8 s, how tall is the building?

*asked by mel on February 9, 2010* -
## Physics

A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial speed of 17 m/s. If the brick is in flight for 3.3 s, how tall is the building? m

*asked by Crown on September 12, 2012* -
## physics

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 14 m/s. If the brick is in flight for 3s, how tall is the building?

*asked by TNT on February 16, 2018* -
## Physics

So you chose to use a solid sphere and you give it a speed of 5.9m/s on a flat horizontal surface which is the speed it has when it reaches a 22degree incline. A) How far along the incline will it go?

*asked by Sierra on February 22, 2016* -
## Physics

A 5.5-kg box is under an upward force of 45 N which makes a 60o angle with its normal. Find the magnitude of the horizontal acceleration. What is the normal force?

*asked by 1234 on June 11, 2012* -
## Physics

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 12 m/s. If the brick is in flight for 3.5 s, how tall is the building?

*asked by Court on September 11, 2011* -
## physics

If you throw a ball straight out horizontal to the ground and your friend drops a ball from the same height, will the balls hit the ground at the same time?

*asked by alice on April 21, 2010* -
## Physics

A golfer hits a golf ball at an angle of 35° above horizontal. If the initial velocity is 55 m/s, how long does the ball soar before it hits the ground?

*asked by Elaina on December 1, 2010* -
## Physics

Consider the motion of the two projectiles fired at t = 0. Their initial speeds are both v0 but they are fired with different initial angles θ1 and θ2 with respect to the horizontal. What is the ratio of the times of the flights?

*asked by Zachary on September 14, 2017* -
## physics

A brick is thrown upward from the top of a building at an angle of 40° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 3.4 s, how tall is the building?

*asked by kaf on January 29, 2012* -
## math

a lighthouse is 30m high. the angle of elevation from a ship to the top of the tower is 17 degrees. what is the horizontal distance from the ship to the lighthouse?

*asked by Sally on September 20, 2016* -
## physics

The horizontal door of a substance at a depth of 500m has an area of 0.4m^2 . Calculate the force exerted by the sea water on the door at this depth.

*asked by somay on June 14, 2016* -
## physics

a roller whose diamater is 1.0m.weight 360N.what horizontal force is necessary to pull the roller over a brick 0.1m,heigh when the force is applied at the centre?

*asked by jack on September 10, 2011* -
## Science

Two tugboats are towing a ship. Each exerts a horizontal force of 5 tons and the angle between their towropes is 90°. What net force is exerted on the ship?

*asked by Chris on September 3, 2011* -
## physic

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? in (m)

*asked by mark on February 3, 2016* -
## physics

The vertical and horizontal component of the initial velocity of a projectile are 36m/s and 64m/s. Find the initial velocity and angle inclination

*asked by charles on March 6, 2016* -
## physics

If a ball is thrown off a 17.9m roof with the velocity of 23.9m/s and it takes 1.91sec to reach the ground, What is the horizontal displacement and the Velocity right before it hits the ground?

*asked by Kelly on December 11, 2009* -
## 11th grade pre ap physics

An athlete whirls a 7.00 kg hammer tied to the end of a 1.1 m chain in a horizontal circle. The hammer makes one revolution in 0.9 s. What is the tension in the chain?

*asked by asian on December 13, 2010* -
## PHYSICS

A large, flat, horizontal sheet of charge has a charge per unit area of 2.05 µC/m2. Find the electric field just above the middle of the sheet.

*asked by smita on October 6, 2013* -
## physics

A water balloon is launched at a building 24m away with an initial velocity of 18 m/s at an angle of 50° above the horizontal. At what height will the balloon strike the building?

*asked by James on October 13, 2014* -
## physics

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building?

*asked by lisa on February 5, 2016* -
## physics

At the base of a frictionless icy hill that rises at 23.0m above the horizontal, a toboggan has a speed of 12.0m/s toward the hill. How high vertically above the base will it go before stopping?

*asked by Chris on October 24, 2011* -
## physics

Janet jumps oﬀ a high diving platform with a horizontal velocity of 2.25 m/s and lands in the water 1.6 s later. How high is the platform? The acceleration of gravity is 9.8 m/s 2

*asked by David on October 4, 2012* -
## Physics

A hill is 290 m long and makes an angle of 10 degrees with the horizontal. As a 68 kg jogger runs up the hill, how much work does gravity do on the jogger?

*asked by Casey on December 16, 2010* -
## physics

A large, flat, horizontal sheet of charge has a charge per unit area of 2.05 µC/m2. Find the electric field just above the middle of the sheet. kN/C

*asked by priya on September 13, 2013* -
## physics

What are the horizontal and vertical components of a cat's displacement when it has climbed 5m directly up a tree? Has it moved horizontally when it gors directly vertical?

*asked by anonymous on October 10, 2006* -
## physics

A large, flat, horizontal sheet of charge has a charge per unit area of 2.05 µC/m2. Find the electric field just above the middle of the sheet.

*asked by preya on September 8, 2013* -
## Calculus

Sketch the graph of f(x)=-x^4 + 4x^3 - 16x + 16: Find the critical points, concave up/down, inflection points, vertical asymptotes and horizontal asymptotes.

*asked by Alan on April 17, 2012* -
## Science

2. A cable pulls a 15.0 kg crate at constant speed across a horizontal table.The tension in the cable is 60.0 N. 1. What is the frictional force and normal force?

*asked by Boberto on February 26, 2017* -
## PHYSICS

a metal ball tied to the end of a string 1.8 m long is whirled in a horizontal circle at 4 m/s. what is the mass of the ball if the tension on the string is 30 N ?

*asked by Princess Blabla on September 12, 2015* -
## Physics 141

A 71-kg skier is going down a slope oriented 37° above the horizontal. The area of each ski in contact with the snow is 0.13 m2. Determine the pressure that each ski exerts on the snow.

*asked by dakota22 on April 12, 2014* -
## phy

A soccer ball is kicked with a speed of 9.15 m/s at an angle of 55.0^\circ above the horizontal. 1-If the ball lands at the same level from which it was kicked, how long was it in the air?

*asked by elin on July 9, 2011* -
## physics

A ball is thrown at 22 m/s at 45 degrees to the horizontal. A 5 foot tall fence is located 100 meters away. Does the ball make it over the fence?

*asked by Kareem on January 15, 2015* -
## PHYSICS

A metal ball tied to the end of a string 1.8 m long is whirled in a horizontal circle at 4 m/s. What is the mass of the ball if the tension on the string is 30 N?

*asked by NotYourTyn on September 13, 2015* -
## Physics

A mass slides down a smooth incline, the normal force is exactly 1/3 the weight of the mass. Find the angle of the incline, relative to the horizontal.

*asked by Tara on May 26, 2015* -
## Physics

1) A shell is fired from a mortar over level terrain. The firing speed is 52 m/s and the mortar is aimed 63° above the horizontal. Find the range of the shell.

*asked by Kathalina on October 27, 2011* -
## physics

A body of mass m is suspended by two strings (right strings equals an angle a with horizontal and left an angle B with vertical. Dra the figure.

*asked by rupesh on April 21, 2014* -
## HELP>>PLZ

the vertical component of earth magnetic field at a place is root3 times the horizontal component.What is the value of angle of dip at this place?

*asked by Abhishek on March 3, 2013* -
## math

The roof of a home rises vertically a distance of 8 ft through a horizontal distance of 12 ft. Find the pitch (slope) of the roof plz help ASAP

*asked by Anonymous on May 3, 2016* -
## Physics

A soccer ball is kicked with a speed of 9.95m/s at an angle of 35.0∘ above the horizontal.If the ball lands at the same level from which it was kicked, how long was it in the air?

*asked by Ashley on June 4, 2014* -
## physics help please

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? in (m)

*asked by lisa on February 4, 2016* -
## Math - Transformations

State the transformation for g(x) = -2 (2x - 4)³ - 1 Would it be a vertical stretch by a factor of 2 a reflection in the x-axis a horizontal stretch by a factor of 1/2 a translation 4 units right and 1 unit down Am i right?

*asked by Jen on July 11, 2016* -
## physics

If you use a horizontal force of 30.0 N to slide a 11.5 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor? how i do this?

*asked by Anonymous on November 18, 2009* -
## physics

if you use a horizontal force of 30 N to slide a 12 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor?

*asked by carly on October 12, 2015* -
## physics

Janet jumps off a high diving platform with a horizontal velocity of 2.11 m/s and lands in the water 2.6 s later. How high is the platform? The acceleration of gravity is 9.8 m/s2 .

*asked by Rachel on October 21, 2012* -
## Physics

A baseball is hit at 35.0m/s at an angle of 25.0 degrees to the horizontal. How high will the ball go> When will it reach that height? How far across the baseball field will the ball travel? Thanks.

*asked by Tri on March 20, 2008* -
## Economis

A demand curve that is unit elastic everywhere is a. linear and slopes downward b. linear and slopes upward c. vertical d. horizontal e. nonlinear

*asked by Rosa on January 19, 2010* -
## physics

A brick is thrown upward from the top of a building at an angle of 35° to the horizontal and with an initial speed of 15 m/s. If the brick is in flight for 2.7 s, how tall is the building? (in m) could someone help me please!!!

*asked by lisa on February 7, 2016* -
## physics

A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 3.1 s, how tall is the building?

*asked by sid on February 21, 2012* -
## Physics

A force of 20N is applied to a mass of 5kg resting on a rough horizontal surface. If the friction force is 5N, what is the acceleration of the mass?

*asked by Jessica on September 14, 2014* -
## physics

A brick is thrown upward from the top of a building at an angle of 15° to the horizontal and with an initial speed of 16 m/s. If the brick is in flight for 2.8 s, how tall is the building?

*asked by Claudia on September 27, 2010* -
## Physics

An athlete competing in long jump leaves the ground with a speed of 9.14 m/s at an angle of 35 degrees above the horizontal. What is the length of the athlete's jump?

*asked by Amanda on October 5, 2010* -
## Physics

A particle is projected at 10ms^-1 from a height of 45m. Calculate the horizontal distance covered by the particle before reaching the ground(g=10ms^-2)

*asked by Anonymous on February 8, 2018* -
## Science

How much work is done on the trolley by the force,if the force applied is 200N at an angle of 37 degrees to the horizontal and the trolley moves a distance of 10m.

*asked by ANNAH on May 1, 2014* -
## physics

A soccer ball is kicked with a speed of 16.7 m/s at an angle of 45.0 ∘ above the horizontal.If the ball lands at the same level from which it was kicked, for what amount of time was it in the air?

*asked by ana on February 20, 2017* -
## physics

A brick is thrown upward from the top of a building at an angle of 25° to the horizontal and with an initial speed of 17 m/s. If the brick is in flight for 2.5 s, how tall is the building?

*asked by tiffany on September 20, 2010* -
## physics

A brick is thrown upward from the top of a building at an angle of 40° to the horizontal and with an initial speed of 12 m/s. If the brick is in flight for 2.5 s, how tall is the building?

*asked by Anonymous on September 25, 2010* -
## physics

A gate is free to rotate without friction about its hinges at H. The gate is initially at rest. A 4.00 kg ball of mud is thrown at 18.0 m/s towards the center of the gate and the path of the mud is perpendicular to the plane of the gate. A) Compute the

*asked by Anonymous on April 13, 2013* -
## Math

A box contains 8 white balls, 7 black and 4 red. How many red balls must be added to the box so that the probability is 3/4? How many black balls need to be added so that it is 1/4? Thanks I have a mental block with this.

*asked by Bella on August 23, 2015* -
## Physics

Light is bent as it enters a tank of water from air. It is bent to a greater angle when it goes from air to a glass block. Calculate the angle of refraction of 30.0° light shines from water into ice. The indices of refraction for water and ice are 1.36

*asked by Tina on March 24, 2016* -
## Physics

You are driving off of a horizontal cliff, again!!! The cliff is measured to be 35.56 m above a rocky ravine floor, but you land 10.36 m away from the sheer cliff face. How fast were you going when you drove off of the cliff?

*asked by Ashley on September 23, 2015* -
## physics

two forces are acting on an object. F1= 60 N is horizontal while F2= -80N is vertical, what is the magnitude of the net force acting on the object? The answer is 100 N, can some one please explain it though?

*asked by jessica on April 7, 2017* -
## Science Help

A projectile that is launched at 15 degrees and the landing height is the same as the launch position. If this is true, then at what other angle can the projectile be launch to achieve the same horizontal displacement?

*asked by Khloe on March 13, 2015* -
## Math limits

lim as x --> infinity ( 4x + (3 / x^2) ) My work: (4x^3 / x^2) + (3 / x^2) (4x^3 + 3) / x^2 degree of top > degree of bottom No horizontal asymptote, so the limit does not exist The correct answer is infinity. How?

*asked by Paige on October 23, 2016* -
## Science Help

A projectile is launched at 15 degrees and it's landing height is the same as the launch position. If this is true, then at what other angle can the projectile be launch to achieve the same horizontal displacement?

*asked by Steffi on March 15, 2015* -
## physics

A 6.4 cm diameter horizontal pipe gradually narrows to 5.2 cm . When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 30.0 kPa and 20.2 kPa , respectively

*asked by help on April 27, 2017* -
## Physics

A metal ball tied to the end of a string 1.8 m long is whirled in a horizontal circle at 4 m/s. What is the mass of the ball if the tension on the string is 30 N? What formula/s should I use?

*asked by Fey on September 13, 2015* -
## Physics

An arrow is shot with a velocity of 30 m/s at an angle 37° above the horizontal. It is initially 2 meters above the ground and 15 meters from a wall. T what height does it hit the wall? Is it still going up just before it hits or is it already on its way

*asked by Shyne Fornea on September 28, 2016* -
## Calculus

The graph of the equation is x^2+xy+y^2=9 a) What is the equation of the right most vertical tangent? b) That tangent touches the ellipse where y= what? I've calculated the derivative to y'=(-y-2x)/(2y+x) and I found the horizontal tangents. How do I do

*asked by Anonymous on February 28, 2017* -
## math

the horizontal,vertical and diagonal columns and rows of a magic square all add to the same sum.use the digits 1-16 one time each to make a magic square

*asked by samuel on January 14, 2016* -
## Math please help urgent!!

2. If m

*asked by Anna on February 18, 2016* -
## physics

A rock thrown horizontally from a bridge hits the water below 30 meters away in the horizontal direction. If the rock was in the air for 2 seconds, how tall is the bridge?

*asked by Kareem on January 15, 2015* -
## 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.

*asked by Nicole on January 31, 2016* -
## algebra

an access ramp has a height of five feet and a horizontal distance of 60 feet. find the length of l of the ramp tothe nearest tenth of a foot

*asked by brandon on December 16, 2014* -
## Calculus

Use a graphing calculator to graph f(x)=(2x^2-8)/(x^2-6) and then select the response which is true a) f increases without bound b) f has no tangent line c) f has a horizontal tangent line d) none of these responses

*asked by Alice on December 20, 2018* -
## mathematics

A soccer ball is kicked at ground level with a speed of 30 m/s at an angle of 35 degree to the horizontal. how long does it takes for the ball to hit the ground?

*asked by kraften on March 6, 2017* -
## Calculus

I have done one part of this question. I am, however, unsure as to how to set up the graph. Can someone help me? 1. Use a graph to find a number N such that |(6x^2+5x-3)| | |------------- -3 | < 0.2 whenever x>N |(2x^2-1)| | y=2.8 and y=3.2 My issue is how

*asked by Anonymous on September 15, 2015* -
## physics

A man can throw a ball a maximum horizontal distance of 73.4 meters. the acceleration is 9.8 m/s^2. How far can he throw the same ball vertically upward at the same initial speed?

*asked by jay on October 29, 2017* -
## Nat sci

Two tugboats are towing a ship.Each exerts horizontal force of 5.0 tons and the angle between the two ropes is30°.What is the resultant force exerted on the ship

*asked by Fernando cruz on July 14, 2017* -
## math

a boy is flying a kite from a string of length 150m. if the string is taut and makes an angle of 67 degrees with the horizontal,what is the height of the kite

*asked by thelma on April 5, 2019* -
## Physics

A 10.0 kg object is resting on a horizontal surface with a coefficient of friction of 0.7. Determine the minimum force that can move the object.At what inclination should force be applied?

*asked by May on September 14, 2015* -
## physics

An object of mass 5.0 kg is attached to a string of length 2.0 m and rotating in a horizontal circle with an angular velocity of 3.0 rad/s. What is the angular momentum of the object?

*asked by Anonymous on June 10, 2014* -
## physics

rain is falling at 5m/s making 30 degrees with the vertical towards east . to a man walking at 3m/s on a horizontal road towards east , the rain appears to be at a speed of

*asked by shivani on June 15, 2016* -
## math

A kite flight of a tant string of length 50m inclind at angle of 54 degree to the horizontal ground. What is height of the kite above the ground?

*asked by ay on March 15, 2016* -
## Physics

A baseball hit just above the ground leaves the bat at 26 m/s at 45∘ above the horizontal. How far away does the ball strike the ground? How much time is the ball in the air? What is its maximum height?

*asked by Mike on January 30, 2018* -
## Physics

A cannonball is shot upwards with a total velocity of 61.0 m/s at an angle of 45 degrees from the horizontal. What will its total velocity be when it has moved 345 m horizontally from where it started?

*asked by Brittany on February 1, 2015* -
## physics

According to the work-energy theorem, in the absence of friction, if you do 100J of work on a cart while pushing it across a horizontal surface, how much will you increase its kinetic energy?

*asked by Tb on September 22, 2018* -
## Physics

Melvin pulls a sled across level snow with a force of 345 N along a rope that is 31◦ above the horizontal. If the sled moved a distance of 34.5 m, how much work did Melvin do?

*asked by Spooby on February 23, 2016* -
## physics

A ball is thrown at 22m/s at 45 degrees to the horizontal. a fence 5 feet tall is located 100 meters away. Does the ball make it over the fence?

*asked by MIKE on July 11, 2015* -
## physics

A ball rolls of the top of stairway with a horizontal speed of 1.5m\s. The steps are 0.5 metre high and 0.5 metre wide. Which step will the ball hit first?

*asked by beiber on January 15, 2017* -
## Pre-Calculus Help?

the vertical and horizontal positions of a zip line cable are represented by the following parametric equations. Rewrite the parametric equations by elimination the the parameter. x(t)= 3t + 4 y(t) = 5-t a) y = -1/3x+19/3 b) y= 19 - 3x c) y= 2x + 9 d) y=

*asked by ADOG on May 18, 2018* -
## math

the top of a hill is 40m tall. the horizontal distance from the runaway is 325 m. if the pilot clear the top of the hill by 45 m, what is the angle of takeoff?

*asked by shuntea on March 20, 2012* -
## Math

Using these numbers, 2 4/9, 2 5/9, 2 6/9, 2 8/9, 3, 3 1/9, 3 3/9, 3 4/9 & 3 5/9. Build a square where the sum of every horizontal, vertical, and diagonal row is 9. The square has 3 rows across & 3 rows down for a total of 9 small blocks.

*asked by Maddie on April 16, 2014* -
## Physics

Two objects are in contact on a frictionless surface. A horizontal force is applied to one object as shown in the figure below. Use m1 = 1.2 g, m2 = 254 g and F = 0.7 N to find the force between the two objects.

*asked by Natasha on October 6, 2009* -
## Physics(Please help)

A football is kicked with a speed of 18 m/s at an angle of 65° to the horizontal. How long is the football in the air? Neglect air resistance Would I use the equation y=y0 + voy t -1/2gt^2 ?

*asked by Hannah on May 25, 2012* -
## calculus

2. An object is moving along the parabola y = 3x^2. a) When it passes through the point (2, 12), its “horizontal” velocity is dx/dt= 3. What dt is its “vertical” velocity at that instant? b)If it travels in such away that dx/dt=3 for all t,then

*asked by Steve on March 19, 2012* -
## physics

A skier of mass 54.6 kg comes down a slope of constant angle 21◦ with the horizontal. The acceleration of gravity is 9.8 m/s2 . What is the force on the skier parallel to the slope? Answer in units of N

*asked by Connor on January 10, 2012*

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