Tuesday

February 28, 2017
Number of results: 70,803

**Physics**

Which of the following best describes kinematics? a) Kinematics is a part of mechanics that involves the description of motion. b) Kinematics is the branch of physics that deals with the motion of objects and the action of forces on the objects. c)Kinematics is the study of ...

*September 14, 2012 by Kevin*

**Physics - urgent ; test Monday**

Divers entertain tourists in Punta Cana by diving froma cliff 36 meters above water. Determine the landing speed; ignore air resistance and assume the object starts from rest. I'm supposed to be using kinematics formulas. I tried using d=V(i)t+1/2at^2 and then plussing the ...

*February 21, 2009 by Li*

**physics**

A door starts from rest and swings with an angular acceleration, alpha, α = 6 rad/s2, where t is in seconds. Determine the angle in radians through which the door turns in the first 3 s. Hint: kinematics equation for angular position (i.e., angle) is exactly the same as ...

*March 1, 2011 by Anonymous*

**physics**

A door starts from rest and swings with an angular acceleration, alpha, α = 6 rad/s2, where t is in seconds. Determine the angle in radians through which the door turns in the first 3 s. Hint: kinematics equation for angular position (i.e., angle) is exactly the same as ...

*March 2, 2011 by Anonymous*

**Physics**

In physics, how do you solve for the magnitude in 2-D kinematics and what are the x and y-components?

*September 27, 2011 by Astrogirl*

**Physics (Kinematics Check)**

What is the average velocity of a dropped brick that falls 4.0 m? vi = 4.0 m/s vf = 0 m/s a = 9.81 m/s^2 t = vf-vi / a t = -4/9.81 t = 0.41 s v = d/t v = 4.0/0.41 v = 9.81 m/s^2 <----------

*July 8, 2015 by Lucina*

**Physics**

How do I determine the horizontal distance traveled by water passing through a hole of a punctured water bottle. You must use bernoulli's and Kinematics, and find delta x in term of h and y. ( y = the height of water inside the bottle , h = the height of the hole to the floor...

*August 13, 2011 by AfterLife*

**Kinematics Physics**

Please let me know if someone can help with this subject. I have summer school in physics because I did not get the first semester. I am still not getting it. Alyx Yes, we can help you. Post your questions, show your work, and we'll guide you in the right direction.

*July 29, 2006 by Alyx*

**physics**

The vertical leap of a professional NBA athlete is reported to be 47.3 inches. What is his takeoff speed? in m/s? is this kinematics??

*December 10, 2009 by Jan*

**physics**

My teacher needs us to formulate a question for the science fair. Till now, we have only learned the Kinematics equations, HELP, please....

*November 5, 2013 by Lily Gomez*

**Physics**

Rearrange the following kinematics equation for the variable iondicated: a)d=v1t+1/2at^2 i)v1 ii)a b)d=v2t-1/2at^2 i)v2 ii)a

*September 19, 2007 by Katie*

**Physics (Kinematics)**

A race car accelerates uniformly from 10 m/s to 50 m/s in 2 seconds. Determine the acceleration of the car and the distance traveled.

*August 13, 2013 by Ashley*

**Physics (Kinematics)**

A car starts from rest and accelerates uniformly for 10 seconds over a distance of 200 m. Determine the acceleration of the car.

*August 13, 2013 by Ashley*

**physics**

If the angular quantities θ,ω,α were specified in terms of degrees rather than radians, how would the kinematics equations for uniformly accelerated rotational motion have to be altered?

*April 11, 2010 by Charlie*

**Physics (Kinematics)**

A ball is thrown 83.3 m upward and then falls back to earth.Neglecting air resistance, how long will it be in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s

*October 6, 2012 by Joy*

**physics in kinematics**

ebo throws a ball in the air it's velocity at the start is 18m/s at an angle of 37° to the ground express the initial velocity in component vector form?

*December 30, 2015 by Na*

**Physics (Kinematics)**

An airplane accelerates down a runway at 100 m/s2 for 15 s until it finally lifts off the ground. Determine the distance traveled before take-off.

*August 13, 2013 by Ashley*

**physics(kinematics)**

The acceleration of a particle is defined by the relation a=-8m/s2. Knowing that x=20m when t=4 and that x=4m when v=16m/s. Determine. A)the time when the velocity is zero. B)the velocity and total distance traveled when t=11s.

*July 19, 2015 by ben*

**Physics kinematics**

the general "hang time" of a punt is measured to be 4.5sec. if the ball was kicked @ an angle of 63deg. above the horizontal & was caught @ the same level from which it was kicked, what was its initial speed?

*March 13, 2008 by Lisa*

**Physics**

If a lever has a mechanical advantage of 6, and the distance from the fulcrum to the load is .05m, how far is it from the fulcrum to the effort? I think I'm supposed to use some sort of kinematics formula, but I'm really confused.

*September 27, 2008 by Hannah*

**Physics**

This is a two-dimensional kinematics question: A particle's position coordinates (x,y) are (2m, 3m) at t=0; (6m, 7m) at t=2s, and (13m, 14m) at t=5s. Find the average velocity vector between t=0s and a) t=2s, b) t=5s. I don't know how to find this without acceleration being ...

*September 10, 2010 by Anonymous*

**Physics**

A 400 kg baby grand piano is raised to the roof of a 100 m building. If the cable breaks as it reaches this height, what will its velocity be the instant prior to impact? Use energy considerations and verify using kinematics.

*December 8, 2012 by BA*

**physics**

if the angular quantities theta omega and angular acceleration were specified in terms of degrees rather than radians how would the kinematics equations for uniformly accelerated rotational motion have to be altered

*February 28, 2011 by luna*

**physics**

if the angular quantities theta omega and angular acceleration were specified in terms of degrees rather than radians how would the kinematics equations for uniformly accelerated rotational motion have to be altered

*February 28, 2011 by luna*

**physics- Kinematics-Conversions**

Preform the following conversions. 1)27 ft. is how many cm? 2)10 stone/day is how many lbs/min? 3)53 pits/hr is how many steps/day? if someone could even explain how to do it i'd be really greatful thanks !

*June 10, 2012 by yasmeen*

**Physics Kinematics**

A puck slides across a smooth, level tabletop at height H at a constant speed Vo. It slides off the edge of the table and hits the floor a distance x away. What is the algebraic relationship between the distances x and H?

*February 2, 2015 by Vishal*

**physics**

You throw a 0.15 kg ball straight upward from ground level with an initial speed of 15 m/s. (Yes, from ground level. This is to make the calculations easier. If it bothers you, imagine you are standing in a dugout.) Your friend throws a 0.09 kg lump of clay upward after it. ...

*February 28, 2016 by Shelby*

**Physics Kinematics**

A short-putter throws the shot with an initial speed of 16 m/s at a 32.0 degree angle to the horizontal. Question: Calculate the horizontal distance traveled by the shot if it leaves the athletes hand at a height of 2.05 m above the ground?

*June 10, 2012 by Tim Duncan*

**Physics (Kinematics)**

In a television tube, the electron travels from an electron gun to the screen 0.45m away in 6.0×10exponent-9seconds. If the electron starts at rest, what is its final speed when it hots the screen? ( I have the answer,but I don't know how to get it)

*March 5, 2015 by jen*

**Physics 2D Kinematics**

A ball is kicked with an initial velocity of 21 m/s in the horizontal direction and 16 m/s in the vertical direction. (Assume the ball is kicked from the ground.) So Confused . No Idea Where To Start. help Please !

*September 28, 2015 by Dessy*

**Physics help!!!!!!!!!!!**

What are some good websites/youtube videos for learning grade 12 Physics - Dynamics strand: Kinematics (1D & 2D motion), Vectors, Relative Motion, Projectile motion, Frames of reference, Forces, Free Body Diagrams, Problem solving - Force of Friction, Normal Force, Pulleys, ...

*December 10, 2015 by Physics*

**kinematics**

these are two similar kinematics maths question which i don't know. Please help! 1)A particle moves in a straight line so that its distance, s metres, from a fixed point O is given by s = 2t^3 - 3t^2 - 12t + 6, where t is the time in seconds after passing O. Find the minimum ...

*June 19, 2009 by zachary*

**Kinematics**

A car has an acceleration of 2 m/s2. What is its speed 3 seconds after it starts moving?

*February 1, 2011 by Randy*

**physics**

A 1.31 g samara -- the winged fruit of a maple tree -- falls toward the ground with a constant speed of 1.0 m/s (Figure 5-29). I understand that acceleration equals zero, but I don't understand how to find the upward force need to keep the fruit at 1.0 m/s. Is kinematics ...

*February 5, 2010 by Ryan*

**Physics**

A pinball machine has a spring with spring constant of 125N/m. A 65g ball is placed on the spring and the spring is compressed 5cm. How far along the playing surface makes a 15 degrees angle with the horizontal? ignore friction. How to do this using Energies and Work done? No ...

*April 15, 2013 by Sash*

**physics- kinematics**

General question- when do you use NEGATIVE for 9.8m/s^2? Even when the questions says "an object is thrown up in the air from top of the building, on its way down, it misses the building and falls to the ground below." If you do use a negative value, why is that?

*October 2, 2008 by ella*

**11th matriculation physics kinematics**

an aeroplane takes of at an angle of 45deg to the horizontal. If the vertical component of its velocity is 300kmph, Calculate its actual velocity. what is the horizontal component of it velocity?

*July 18, 2010 by shruthi*

**Physics**

This question has to do with kinematics graphing. I CAN NOT REPRODUCE THE GRAPH BUT hope that some help can be given to me with this question. The position versus time for a certain object moving along the x-axis. The object's initial position is -2 m. Find the instantaneous ...

*September 4, 2013 by Deawn*

**kinematics**

A tennis ball is hit with a resultant velocity of 70 m/s^-1 at 20 degrees. What are the vertical and horizontal velocities?

*April 17, 2011 by Madeline*

**physics - uniform circular motion**

Explain why the kinematics equations which describe the motion of the object that has constant acceleration cannot be applied to uniform circular motion.

*August 23, 2010 by Shaila*

**jccc**

when applying the equation of kinematics for an object moving in one dimension which of the following statements is true

*September 2, 2016 by amy*

**Physics: Kinematics**

A speed boat moving at 33.7 m/s approaches a no-wake buoy marker 93.3 m ahead. The pilot slows the boat with a constant deceleration of 2.9 m/s 2 by reducing the throttle. How long does it take the boat to reach the buoy? current work done: x = Vot + (1/2)at^2 93.3 = 0(t) + (1...

*October 29, 2012 by Michelle*

**physics**

A sprinter in a race can run 100m in 11.4 seconds. If it takes him 4.2 seconds to accelerate to top speed, what is the magnitude of his acceleration? Assume that he stays at his top speed from 4.2 seconds till the end. I do not understand which kinematics equation will help, ...

*February 15, 2015 by Allie*

**physics kinematics**

A river flows at 2m/s the velocity of a ferry relative to the shore is 4m/s at right angles to the current what is the velocity of the ferry relative to the current?

*December 31, 2015 by Na*

**Physics Changing Acceleration**

Derive position, velocity, and acceleration kinematics equations for an object undergoing a changing acceleration? I understand that somehow we need to get (∆a/∆t) as the change in acceleration into the kinematic equations but I really don't know where to start.

*September 28, 2013 by K*

**Physics Kinematics**

A basketball is launched with an initial speed of 12.0 m/s at 45 degrees from the ground. The height of the basket y = 2.50m. From what distance x the ball is shot? Note : The trajectory is like a basketball shot, the highest point the ball reaches is higher than the basket ...

*February 2, 2015 by Vishal*

**Physics Kinematics.**

A ball is kicked with an initial velocity of 21 m/s in the horizontal direction and 16 m/s in the vertical direction. (Assume the ball is kicked from the ground.) (a) At what speed does the ball hit the ground? (b) For how long does the ball remain in the air? (c) What maximum...

*September 28, 2015 by Destiny*

**Physics (Kinematics)**

In the same instant that a Porsche races past him at 130 km/h, a speed cop gets off his motorcycle, accelerates uniformly at 8 m/s^2, to catch the speedster. After 5 seconds the trafic officer reaches his top speed, which he then maintains until he reaches up to the car. How ...

*March 10, 2016 by Jonathan Nokhoya*

**Kinematics**

A car traveling with a velocity of 4 m/s accelerates at 3 m/s^2(squared) for 10 s. How far does the car travel in the 10s?

*June 10, 2012 by Anonymous*

**Physics kinematics**

An archer shoots an arrow at a 72.0 m distant target, the bull's-eye of which is at same height as the release height of the arrow. (a) At what angle must the arrow be released to hit the bull's-eye if its initial speed is 36.0 m/s? (Although neglected here, the atmosphere ...

*September 28, 2015 by Elijah*

**Physics**

A 200g box is moving on a table with velocity of 23m/s. There is a coefficient of friction of 0.032 between the table an the box. A force pushes the box for 1.2m which increases the velocity to 28m/s. Calculate the force that was applied. How do we solve this using energies ...

*April 15, 2013 by Sash*

**Physics kinematics**

The break of a car can slow it down from 60 miles per hour to 40 miles per hour in two secs how long it bring the car to a stop from an initial velocity of 25 miles per hour at the same acceleration

*August 2, 2015 by Ggg*

**kinematics**

An individual's arm segment is .18m long and has an angular velocity of 117degrees/s. What is the tangential velocity of the wrist?

*November 4, 2009 by Dawn*

**Physics**

Tarzan plans to corss a gorge by swinging in an arc form a hanging vine. If his arms are capable of exerting a force of 1400 N on the rope, what is the maximum speed he can tolerate at the lowest point of his swing? his mass is 80 kg and the vine is 4.8 m long. Ok If i\'m ...

*September 6, 2009 by Physics*

**physics kinematics**

A red car and green car , identical except for their colours move towards each other in adjacent lanes . At time=0 , the red car is at x=0m and the green car is at x=220m . If the red car has a constant velocity of 20km/h the cars will meet AR x=44.5m and if it has a constant ...

*September 13, 2012 by HW HELP THANKS*

**Physics**

Starting with the kinematics equation x = vot + ½ at^2, derive an expression relating the acceleration and initial velocity of an object to two paired position and time measurements. In other words, if an object's position is x1 at t1, find the acceleration a and the initial ...

*September 11, 2012 by beanstalk1*

**Physics**

Bob jumps from a 2.0 m high table and wants to jump over a 0.85 m radius ball. How fast must Bob move horizontally to not land on the ball? If we use kinematics equations for projectile, the answer is 2.66 m/s; however, with this velocity the person will land on the ball. I ...

*September 19, 2012 by Elaine*

**Physics**

I'm having trouble relating Work, with Electric Field, with Kinematics. The question is asking: How fast and what direction is the particle moving, given: Disk: radius = 0.1m, surface charge density = 3.7mC/m2 Particle: 4.5 mC, mass = 75 mg accelerates from a point ...

*February 14, 2010 by so CONFUSED!*

**Physics**

Two cars are traveling along a straight road. Car A maintains a constant speed of 79 km/h and car B maintains a constant speed of 114 km/h. At t = 0, car B is 36 km behind car A. (a) How much farther will car A travel before car B overtakes it? ? km (b) How much ahead of A ...

*July 8, 2015 by Anonymous*

**Physics**

A ball is on the end of a rope that is 1.75 m in length. The ball and rope are attached to a pole and the entire apparatus, including the pole, rotates about the pole's symmetry axis. The rope makes an angle of 78.0° with respect to the vertical. What is the tangential speed ...

*October 23, 2016 by Ray*

**kinematics**

A projectile is launched with an initial velocity of 25 m/s at a launch angle of 36 degrees. What is the magnitude of the projectile’s velocity when it is 7.5 m above the ground?

*February 6, 2012 by Cody*

**Physics**

The initial velocity, the final velocity, and the time are given. Using one of the equations of kinematics, you can calculate the displacement directly. An airplane starts from rest and reaches a takeoff velocity of 60.0 m/s due north in 4.0 s. How far has it traveled before ...

*January 30, 2017 by Ana*

**two dimensional kinematics**

If you can throw a stone straight up to a height of 16m, how far could you throw it horizontally over level ground? Assume the same throwing speed and opitimum launch angle.

*October 8, 2012 by ringo*

**Physics, Kinematics**

You drive with a constant speed of 15.1 m/s for 23.4 s. You then accelerate for 28.7 s to a speed of 25.8 m/s. You then slow to a stop in 37.1 s. How far have you traveled? I've tried dividing this into 3 parts. 1st- constant speed 15.1m/s*23.4s=353.34 m 2nd-accelerating I ...

*December 1, 2011 by Jackie*

**12U Physics**

An object is moving down a ramp that has mu=0.150. It initially starts at (0,1), and the bottom of the ramp is at (sqrt(3),0) Show that the parametric down the ramp are given by: ht tp://img819.imageshack.us/img819/5993/screenhunter03dec061758.gif I know the kinematics ...

*December 6, 2010 by Matt*

**Please help me with M1 kinematics!**

A particle p is initially at the point (2, 6) in relation to an origin O, and is moving with velocity (3i + j) m/s. It has a constant acceleration (16i + 24j)m/s^2. Show that after 2 seconds it is moving directly away from O and find its speed at that time

*February 26, 2012 by Jat*

**Please help me with M1 kinematics!**

A particle is travelling with velocity (4i+5j)m/s. It undergoes an acceleration of magnitude 2.5m/s^2 in a direction given by the vector (3i-4j). Find the velocity and displacement of the particle from its initial position after 4s.

*February 26, 2012 by Jat*

**Physics**

A steel ball has a mass of 4.0kg and rolls along a smooth, level surface at 62m/s. A) Find its kinetic energy(i got this and its 7688 joules) B)?????-At first, the ball was at rest on the surface. A constant force acted on it through a distance of 22 meters to give it the ...

*November 23, 2008 by URGENT!!!!PLEASE*

**Physics - 2-D kinematics**

A soccer ball is kicked with an initial horizontal velocity of 20 m/s and an initial vertical velocity of 16 m/s. I've calculated: Initial Speed: 25.61 m/s Angle: 38.66 degrees Maximum Height it reaches: 13.06 m Distance kicked: 65.29m NOW I NEED: What is the speed of the ball...

*February 3, 2012 by Anonymous*

**physics(kinematics)**

A police officer in a patrol car parked in a 70 Km/h speed zone observes a passing automobile might be intoxicated,the officer starts his car,accelerates uniformly to 90 Km/h in 8s ,and maintaining a constant velocity of 90 Km/h,overtakes the motorist 42s after the automobile ...

*July 31, 2015 by benjamin*

**Physics**

Two trains face each other on adjacent tracks. They are initially at rest, and their front ends are 30 m apart. The train on the left accelerates rightward at 1.17 m/s^2. The train on the right accelerates leftward at 1.1 m/s^2. (a) How far does the train on the left travel ...

*July 9, 2015 by Anonymous*

**Physics**

Derive a function that gives the final speed of the cart as a function of the masses, ramp angle and distance up the ramp that the cart moves. Use conservation of energy to do this-no kinematics or Newton's Laws. I have 3 trials ,, 3 angles and 3 masses ( cart moving up the ...

*July 22, 2011 by AfterLife*

**Physics**

A hot air balloon is ascending straight up at a constnat speed of 7.0 m/s. When th balloon is 12.0 m above the ground, a gun fires a pellet straight up from ground elvel with an initial speed of 30,0 m/s. Along the paths of the balloon and the pellet, there are two places ...

*January 2, 2009 by Anonymous*

**Kinematics. Newtons Laws**

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.

*October 6, 2009 by Natasha*

**Physics - Kinematics**

Need some help with my homework! Question 7 a) Acceleration is the rate of change of velocity Use your definition in (a) to show that v = u + at, where v is the final velocity, u is the initial velocity and a and t are the acceleration and the time interval respectively. State...

*April 17, 2012 by Iman*

**Thank you Ann (kinematics)**

Thank you Ann! I had the equations and really was closing in on the answer... (stopping for 23 s is what really got me confused) in either case, the displacement for a) is 888 m ! Now I'll try to calculate (b). Thank you much! P.S. This is in response to my earlier physics (...

*January 31, 2007 by eric (new chem or physics prob. in)*

**Physics**

Use principles of force and kinematics to answer these: a. A 40 kg skater pushes on the 60 kg skater (initially at rest). As they collide, the 40 kg skater pushes on the 60 kg skater, applying a force 100 Newtons for 1.2 seconds. Find the velocity at which each of them ends up...

*November 1, 2010 by jen*

**physics**

Use principles of force and kinematics to answer these: a. A 40 kg skater pushes on the 60 kg skater (initially at rest). As they collide, the 40 kg skater pushes on the 60 kg skater, applying a force 100 Newtons for 1.2 seconds. Find the velocity at which each of them ends up...

*November 1, 2010 by jen*

**physics**

The tortoise and the hare agree to a race. Of course, they are racing cars, having gotten tired of racing on foot. The tortoise, having just bought a new Mercedes AMG GT, allows the hare to have a running start in his Volkswagen Rabbit. The hare starts the race by getting up ...

*February 15, 2015 by Allie*

**kinematics**

A man stands on a slope of 20 degrees.His weight is 65kg. Given that the coefficient of static friction is 1.5, Calculate the maximum angle that the slope can have to the horizontal before he begins to slide. Also how does the pressure on his feet change with the changing ...

*March 8, 2012 by dmkp*

**help me physics**

suppose the cart has mass m = 203 g, and it strikes the clay at speed vo = 5.24 m/s and comes to a dead stop. Assume the track is frictionless, and the clay is crushed inward by 1.83 cm. a)Find the magnitude of the impulse exerted by the clay on the cart. 1 N-m i got this ...

*November 1, 2010 by jason*

**calc-kinematics**

if a particle moves along a line so that at time t where t [0,pi] its position is given by s(t)=-4cost-t^2/2+10 what is the velocity of the particle when its acceleration is zero? so i found v(t) = 4sint-t a(t)=4cost-1 = 0 solved for t plugged it into v(t) and i got the wrong ...

*March 30, 2010 by James*

**two dimensional kinematics**

A jetliner with an airspeed of 1000 kmlhr sets out on a 1500 km flight due south. To maintain a southward direction, however, the plane must be pointed fifteen degrees west of south. Ifthe flight takes 1 00 min, what is the wind velocity?

*October 8, 2012 by ringo*

**Science**

A forrestry crane is lifting vertically a 2 tons log with a force F = ( 9 + 2 h) where h is the height. Draw the free body diagram with the forces and use work and energy conservation to determine the speed of the log when it has risen h=6m. Apply kinematics to give the ...

*December 13, 2016 by Anonymous*

**kinematics**

a golf club 1.01 m long completes a downswing in .25s through a range of 180Degres. Assume a uniform (constant) angular velocity. What is the tangential velocity of the end of the club? What is the tangential accelration of the end of the club?

*November 4, 2009 by anonymous*

**Kinematics algebra question - Physics 11**

I don't know how to even approach this... It's suppose to be on my physics test. A huntsman fires a gun pointing at a monkey hanging on the branch of a tree. The huntsman and the base of the tree are on a flat horizontal. At the moment the huntsman fires the gun, the monkey ...

*November 8, 2013 by Raylene*

**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 coin is dropped from rest into a well with water 45.0m below the hand that drops the coin. A) How much time passes between the release of the coin and its contact with the water? B)How fast will the coin be going when it lands in the pool? C)How long after the release of the...

*June 28, 2007 by Bob*

**physics**

In Mud buggy driving, people attempt to drive an off-road vehicle over a deep mud puddle. If the buggy stops before the end , it sinks into the mud and needs to be pulled out with a tow truck. A racer is driving his mud buggy in a straight line. when he hits the edge of the ...

*September 18, 2016 by Matt*

**Algebra HELP!**

Starting with the kinematics equation x = vot + ½ at^2, derive an expresion relating the acceleration and initial velocity of an object to two paired position and time measurements. In other words, if an object's position is x1 at t1, find the acceleration a and the inital ...

*September 11, 2012 by Jack*

**Math**

Starting with the kinematics equation x = vot + ½ at^2, derive an expresion relating the acceleration and initial velocity of an object to two paired position and time measurements. In other words, if an object's position is x1 at t1, find the acceleration a and the inital ...

*September 11, 2012 by Jack1*

**Kinematics**

A 55.0kg box rests on a horizontal surface. The coefficient of static friction between the box and the surface is .300. What horizontal force must be applied to the box for it to start sliding along the surface? Please write out the solution. I am getting an answer of 165N but...

*October 5, 2012 by Jaybird*

**Physics**

Speedy Sue during is driving at 30.0m/s and enters a 1 lane tunnel. She then observes a slow moving van 155m ahead traveling at 5.0m/s. She applies the brakes but can only accelerate at -2.0m/s^2 b/c road is wet. a) will there be a collision? How do you know? b) If there is a ...

*September 24, 2007 by ~christina~*

**Kinematics. Newtons Laws**

A standard man does reverse curls in a gym. He holds his arms straight, using an overhand grip to hold the bar. If the mass of the bar is given as 127 kg, what is the tension in each of his shoulders? Consider the weight of the arm and the weight of the bar. Note: Use 4.9kg as...

*October 6, 2009 by Natasha*

**Physics**

A tower clock has an hour hand 2.70 m long with a mass of 60.o kg, and a minute hand 4.50 m long with a mass of 100 kg. Calculate the total rotational kinetic energy of the two hands about the axis of rotation. Sol: I know that Kr = 1/2Iw^2 or moment of inertia * omega squared...

*April 18, 2007 by Anderson*

**kinematics**

A car is travelling on a banked circular racetrack, Given that the track is banked at an angle of 16degree to the horizontal and the radius of the track is 50 metres and there are no friction forces present a) draw a free body diagram of the car b)calculate the linear velocity...

*May 30, 2012 by dmkp*

**magnets**

A proton with a velocity of 2.0 x 10^7 m/s in the horizontal (+x) direction enters a region of uniform magnetic field that is 1 meter wide and points out of the page with a magnitude of 0.05 Tesla. At what angle below the x-axis, in degrees, does the proton's trajectory emerge...

*November 20, 2013 by James*

**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*

**physics**

A merry-go-round is stationary. A dog is running on the ground just outside its circumference, moving with a constant angular speed of 0.705 rad/s. The dog does not change his pace when he sees what he has been looking for: a bone resting on the merry-go-round one third of a ...

*March 1, 2011 by Anonymous*

**Mechanics, Rigid body**

At t = 0 s a flywheel is rotating at 20 rpm. A motor gives it a constant acceleration of 1 rad/s^2 until it reaches 100 rpm. The motor is then disconnected. How many revolutions are completed at t = 21 s? What I've done so far is multiply my 20rpm and 100rpm by (2pi/60) to get...

*December 14, 2014 by Marissa*