Saturday

October 25, 2014

October 25, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics Resistance**

A piece of wire of resistance, R and uniform cross sectional area, A is cut into four equal parts and bundled together to form a thicker wire. The resistance of the bundled wire is: A 16R B 1/4R C 4R D 1/16R It's either 16 or 1/16 im not sureee. So I need help for the ...
*Sunday, October 5, 2014 at 2:09am*

**Physics**

Two sources of equal amplitude undergo interference the energy at maxima is four times that due to either source is this a violation of the principle of conservation of energy. Explain. Can someone help me summarize a good model answer and further explanation of the answer? ...
*Sunday, October 5, 2014 at 12:59am*

**physics**

A truck of mass 8912 kg moving at a speed of 66.7 mph has lost its brakes. Fortunately, the driver finds a runaway lane, a gravel-covered incline that uses friction to stop a truck in such a situation; see the figure. In this case, the incline makes an angle of θ = 36.75&...
*Sunday, October 5, 2014 at 12:17am*

**Physics**

A pilot points his aircraft due easy, while wind blows from the south. If the resultant velocity of the aircraft is 44m/s 22 degrees [n] of [e], at what speed does the wind blow?
*Saturday, October 4, 2014 at 10:04pm*

**Physics**

A freight train has mass of 1.6 x 107 kg. If the locomotive can exert a constant pull of 760000 N, how long does it take to increase the speed of the train from rest to 79 km/h? Answer in units of min.
*Saturday, October 4, 2014 at 10:00pm*

**Physics**

An object that starts from rest completes 7 revs in 3 seconds. What is angular accel. in rad/s2?
*Saturday, October 4, 2014 at 9:30pm*

**Physics**

A 7.80 kg particle starts from rest and moves a distance of 8.90 m in 2.60 s under the action of a single, constant force. Find the magnitude of the force.
*Saturday, October 4, 2014 at 9:13pm*

**physics**

The distance between two telephone poles is 54 m. When a 2.0 kg bird lands on the telephone wire midway between the poles, the wire sags 0.16 m. How much tension in the wire does the bird produce? Ignore the weight of the wire. Answer in units of N.
*Saturday, October 4, 2014 at 9:09pm*

**Physics**

A car drives at 15 m/s and has an air resistance force of 277 N. What is the air resistance force at 30 m/s? A truck drives at 9.7 m/s and has an air resistance force of 380 N. What is the air resistance force at 32 m/s? A 85.0 kg skydiver is falling at a constant speed of 32....
*Saturday, October 4, 2014 at 8:40pm*

**Physics**

An airplane dropping supplies to northern villages that are isolated by severe blizzards and cannot be reached by land vehicles. The airplane is flying at an altitude of 785m and at a constant horizontal velocity of 53.5 m/s. At what horizontal distance before the drop point ...
*Saturday, October 4, 2014 at 5:44pm*

**physics**

You use an inclined plane to move furniture into a truck. You perform 224 kJ of work, but only do 91 kJ of useful work. What is the efficiency of the inclined plane?
*Saturday, October 4, 2014 at 5:26pm*

**physics**

A car of mass 550 kg is moving at a speed of 1.5 m/s. A man pushes the car, increasing the speed to 3.2 m/s. How much work did the man do? A. 3435 J B. 2816 J C. 2197 J D. 4123 J
*Saturday, October 4, 2014 at 5:17pm*

**Physics**

A basketball is thrown at 45° to the horizontal. The hoop is located 6.2 m away horizontally at a height of 1.1 m above the point of release. What is the required initial speed? I know that I need to use d = vit + (0.5)at^2, but I then get stuck. Thanks!
*Saturday, October 4, 2014 at 5:08pm*

**Physics**

What should the theoretical maximum value of the uniform acceleration of a object freely rolling down an inclined plane and what would the angle of elevation be?
*Saturday, October 4, 2014 at 4:29pm*

**Physics**

A 55-kg block, starting from rest, is pushed a distance of 5.0m across a floor by a horizontal force Fp whose magnitude is 140N. Fp is parallel to the displacement of the block. The final speed of the block is 2.35m/s. a. How much work was converted to thermal energy? What ...
*Saturday, October 4, 2014 at 8:46am*

**physics**

Find the magnitude of -A+B(vectors),where A(vector) = (31.3, 63.9) B(vector) =(88.5, -142.0)
*Saturday, October 4, 2014 at 8:18am*

**physics**

is sky diving free fall?i mean free fall is when the only force acting is gravitational force but in sky diving drag force also present? so how sky diving can be considered as free fall?
*Saturday, October 4, 2014 at 5:56am*

**physics**

In free fall ,atmospheric pressure is also not present?i mean pressure is force per unit area ,so atmospheric pressure comprises force but? in free fall there should be only gravitational force so atmospheric pressure is not present in free fall?
*Saturday, October 4, 2014 at 5:55am*

**physics**

Why in free fall condition the length of water column in capillary tube is equal to length of tube?h=2Tcos theta /drg where h is rise in? height ,T=SURFACE TENSION d=-DENSITY r=RADIUS OF TUBE AND g=ACCELERATION DUE TO GRAVITY explain from this formula how rise in height equal ...
*Saturday, October 4, 2014 at 5:54am*

**physics**

A 74.0kg person is put on an exercise program by a physical therapist, the goal being to burn up 550 food calories in each daily session. Recall that human muscles are about 21.0% in converting the energy they use up into mechanical energy. The exercise program consists of a ...
*Saturday, October 4, 2014 at 5:06am*

**physics**

You overindulged on a delicious dessert, so you plan to work off the extra calories at the gym. To accomplish this, you decide to do a series of arm raises holding a 5.5kg weight in one hand. The distance from your elbow to the weight is 36cm , and in each arm raise you start ...
*Saturday, October 4, 2014 at 5:05am*

**AS Physics**

A driver leaves his car without applying the hand brakes on a road inclined at an angle of 25 degrees. The car starts to roll down the road with the driver chasing from behind after moving a distance of 20 m the speed of the car is 5.0 ms-1. Calculate the coefficient of static...
*Saturday, October 4, 2014 at 3:01am*

**physics**

a projectile thrown at an angle Ө with the horizontal has horizontal range R and maximum height h. show that the tangent of the angle of projection is given by 4h/R
*Saturday, October 4, 2014 at 2:41am*

**Physics**

A monkey throws a banana horizontally from the top of a tree. The banana hits the ground 3.03 seconds later and lands d = 30.9 meters from the base of the tree. 1. What was the resultant velocity of the banana as it hit the ground? magnitude = ? m/sec. 2. What is the angle ?&...
*Friday, October 3, 2014 at 10:52pm*

**Physics**

You kick a ball off the ground with a horizontal speed of 16 m/sec and a vertical speed of 20.7 m/sec. 1. The ball reaches it's highest point how many seconds after it is kicked. 2. It reaches the ground how many seconds after it is kicked.
*Friday, October 3, 2014 at 10:48pm*

**physics**

A stunt car driver drives off an h = 6.7 m-high cliff into a lake with a horizontal speed of 14 m/s. The car needs to clear an 8.0 m-long ledge that is 5.0 m below the edge of the cliff. The car successfully misses the ledge on the way down. With what speed does the car hit ...
*Friday, October 3, 2014 at 10:11pm*

**Physics**

What is the magnitude of the average force required to stop an 1400kg car in 9.0s if the car is traveling at 85km/h ?
*Friday, October 3, 2014 at 9:41pm*

**Physics**

A 61.5-Ω resistor is connected in parallel with a 146.6-Ω resistor. This parallel group is connected in series with a 16.0-Ω resistor. The total combination is connected across a 13.6-V battery. Find (a) the current and (b) the power dissipated in the 146.6-&#...
*Friday, October 3, 2014 at 8:15pm*

**Physics**

A 4.55 kg steel ball is dropped onto a copper plate from a height of 10.0 m. If the ball leaves a dent 2.80 mm deep in the plate, what is the average force exerted by the plate on the ball during the impact?
*Friday, October 3, 2014 at 8:14pm*

**Physics**

A car is driving on a level highway. It is acted upon by the following forces: a downward gravitational force of 12 kN, an upward contact force due to the road of 12 kN, another contact force due to the road of 7 kN directed West, and a drag force due to air resistance of 5 kN...
*Friday, October 3, 2014 at 7:20pm*

**physics**

A ball is attached to a paddle by a rubber band. The ball is initially moving away from the paddle with a speed of 4.4 m/s. After 0.33 seconds it is moving towards the paddle with a velocity of 2.8 m/s. What is the average acceleration in m/s2 during this time?
*Friday, October 3, 2014 at 6:20pm*

**Physics **

A block of mass 50 kg is pulled on a frictionless floor by F=210N directed to 30angle horizontally, If the block moves 3m, find work done? a. 115 √2J b. 315 √3J Answer is B 315 √3J , my question is how to solve it in this way i mean, i solved it like this, w=...
*Friday, October 3, 2014 at 6:14pm*

**Physics**

A golf ball is shot from a tee, elevated 20m above the green, with an initial speed of 27m/s at an angle of 50° above horizontal. a) What will be the speed of the golf ball before it hits the green, 20m below it started? b) How much time will it take for the ball to travel...
*Friday, October 3, 2014 at 5:27pm*

**Physics **

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.5 m/s via ...
*Friday, October 3, 2014 at 5:13pm*

**Physics**

The height of the sun from point A is larger than from point B by 4.92 degree.If the distance between A and B is 500 Km, How long is the circumference of the earth? ( assume that earth is perfect sphere)
*Friday, October 3, 2014 at 4:39pm*

**Physics **

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
*Friday, October 3, 2014 at 4:20pm*

**physics**

Three forces act on a moving object. One force has a magnitude of 62.6 N and is directed due north. Another has a magnitude of 45.9 N and is directed due west. What must be (a) the magnitude and (b) the direction of the third force, such that the object continues to move with ...
*Friday, October 3, 2014 at 3:40pm*

**PHYSICS**

Starting from rest, a 2.0 10-4-kg flea springs straight upward. While the flea is pushing off from the ground, the ground exerts an average upward force of 0.36 N on it. This force does +2.5 10-4 J of work on the flea. -How far does the flea move while it's pushing off?
*Friday, October 3, 2014 at 3:40pm*

**Physics**

A 55-kg soccer player jumps vertically upwards and heads the 0.45-kg ball as it is descending vertically with a speed of 29 m/s. If the ball is in contact with the player's head for 16 ms, what is the average acceleration of the ball? (Note that the force of gravity may be...
*Friday, October 3, 2014 at 3:28pm*

**PHYSICS**

A golf club strikes a 0.041-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 6400 N, and is in contact with the ball for a distance of 0.012 m. With...
*Friday, October 3, 2014 at 3:08pm*

**Physics**

Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is eighty-two times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites.
*Friday, October 3, 2014 at 3:00pm*

**Physics**

The drawing below shows a person who, starting from rest at the top of a cliff, swings down at the end of a rope, releases it, and falls into the water below. There are two paths by which the person can enter the water. Suppose he enters the water at a speed of 18.5 m/s via ...
*Friday, October 3, 2014 at 2:48pm*

**Physics**

A 36-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 185 J from 460 J. How high does she rise during this interval? Neglect air resistance.
*Friday, October 3, 2014 at 2:26pm*

**Physics**

A person pushes a 16.0-kg shopping cart at a constant velocity for a distance of 18.0 m. She pushes in a direction 20.0° below the horizontal. A 40.0-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force that the shopper exerts? (b) ...
*Friday, October 3, 2014 at 2:14pm*

**Physics**

A 7300-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
*Friday, October 3, 2014 at 2:05pm*

**physics**

A basketball player makes a jump shot. The 0.600-kg ball is released at a height of 2.13 m above the floor with a speed of 7.55 m/s. The ball goes through the net 3.10 m above the floor at a speed of 3.95 m/s. What is the work done on the ball by air resistance, a ...
*Friday, October 3, 2014 at 2:01pm*

**Physics**

A golf club strikes a 0.041-kg golf ball in order to launch it from the tee. For simplicity, assume that the average net force applied to the ball acts parallel to the ball's motion, has a magnitude of 6400 N, and is in contact with the ball for a distance of 0.012 m. With...
*Friday, October 3, 2014 at 12:42pm*

**Physics**

Suppose in the figure blow that +1.00 103 J of work is done by the force F with arrow (magnitude = 30.0 N) in moving the suitcase a distance of 51.0 m. At what angle θ, counterclockwise from the x-axis, is the force oriented with respect to the ground?
*Friday, October 3, 2014 at 12:38pm*

**Physics**

Two satellites, A and B, are in different circular orbits about the earth. The orbital speed of satellite A is eighty-two times that of satellite B. Find the ratio (TA/TB) of the periods of the satellites.
*Friday, October 3, 2014 at 12:36pm*

**urgent physics ?**

I have drawn my force body diagrams, but I need help making forming the equation for this problem. Any assistance is greatly appreciated! A 60 kg block slides along the top of a 100 kg block. The lighter block has an acceleration of 3.8 m/s2 when a horizontal force F= 390 N is...
*Friday, October 3, 2014 at 12:11pm*

**physics**

Could anyone help me set up this equation? I drew my force body diagram but wasn't sure how to include the downward force (im assuming i use either sine or cosine?) A force of 340 N pushes a 54 kg object. Find the acceleration of the box if the force makes an angle of 70 ...
*Friday, October 3, 2014 at 11:32am*

**physics help**

I know that the answer to this problem is (0.2237232293) and to begin it by making a force body diagram, but I need help setting up the equation(s). Thanks! A box rest on an incline making a 30 angle with the horizontal. It is found that a parallel force to the incline of at ...
*Friday, October 3, 2014 at 11:28am*

**physics**

An arrow is aimed horizontally, directly at a target 20.6 meters away. when the arrow is released, it lands 0.095 meters below the target point. a) How long was the arrow in the air? b) How fast was the arrow moving when it left the bow?
*Friday, October 3, 2014 at 11:16am*

**physics urgent**

I need help with this problem. I know the answer is (2.1630342940) but I have no idea how to get there. I know i need to sum the forces for each. Block m1( 6 kg ), lies on an incline plane with a coefficient of kinetic friction of 0.15. m1 is connected to mass m2 by a massless...
*Friday, October 3, 2014 at 10:29am*

**physics**

What is the acceleration of a car going from 3.0 x 101 km/hr to 1.20 x 102 km/hr in 3.0 x 101 sec?
*Friday, October 3, 2014 at 9:18am*

**Physics**

Let's assume that solar light reaches a silicon solar cell with an angle of incidence of θi=0o. For simplicity, let's consider the refractive index of silicon to be nSi=3.5. The refractive index of air is nair=1. What percentage of light would be lost due to ...
*Friday, October 3, 2014 at 12:51am*

**Physics**

A solar cell with dimensions 12cm x 12cm is illuminated at standard test conditions. The cell presents the following external parameters: Voc=0.8V,Isc=3A,Vmp=0.75V,Imp=2.5A Calculate the fill factor in percentage [%]: Calculate the efficiency (in %):
*Friday, October 3, 2014 at 12:50am*

**Physics**

The current density of an ideal p-n junction under illumination can be described by: J(V)=Jph−J0(e^qV/kT−1) where Jph is the photocurrent density, J0 the saturation current density, q the elementary charge, V the voltage, k the Boltzmann's constant, and T the ...
*Friday, October 3, 2014 at 12:48am*

**Physics**

The width of the space charge region at a p-n junction is reduced by applying a voltage bias over the p-n junction. What is the correct statement on both the bias voltage and the p-n junction? The voltage is a forward bias and the diffusion of the majority charge carriers ...
*Friday, October 3, 2014 at 12:46am*

**physics**

when the students place the unknown cart on the scale the scale reads the mass of 1.20 kg a)calculate the percent difference b) state the reason for the difference . explain
*Friday, October 3, 2014 at 12:43am*

**physics**

A car travels along a straight stretch of road. It proceeds for 15.9 mi at 51 mi/h, then 25.3 mi at 41 mi/h, and finally 34.3 mi at 38.6 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h
*Friday, October 3, 2014 at 12:21am*

**physics**

A crate rests on a flatbed truck which is initially traveling at 17.8 m/s on a level road. The driver applies the brakes and the truck is brought to a halt in a distance of 33.1 m. If the deceleration of the truck is constant, what is the minimum coefficient of friction ...
*Thursday, October 2, 2014 at 11:49pm*

**Physics**

route that takes it 12 km [E] of its starting position in 24 min. In another 24 min, the bus turns around and retraces its path to the terminal.
*Thursday, October 2, 2014 at 9:52pm*

**physics**

On a spacecraft, two engines are turned on for 525 s at a moment when the velocity of the craft has x and y components of v0x = 4780 m/s and v0y = 8850 m/s. While the engines are firing, the craft undergoes a displacement that has components of x = 3.54 x 106 m and y = 7.77 x ...
*Thursday, October 2, 2014 at 9:49pm*

**physics**

A car is traveling at 100 km/h, due northwest. The driver puts on the brakes and turns the corner. Four seconds later, he is heading east at 50 km/h. What is the average acceleration
*Thursday, October 2, 2014 at 9:24pm*

**physics**

Drow a velocity time graph graph for the ball starting 1.0 s before the collision to 1.0s after the collision
*Thursday, October 2, 2014 at 6:51pm*

**Physics**

The hare and the tortoise are at the starting line together. When the gun goes off, the hare moves off at a constant speed of 10 meters per second. (Ignore the acceleration required to get the animal to this speed.) The tortoise starts from a dead stop, but accelerates at a ...
*Thursday, October 2, 2014 at 6:34pm*

**Physics**

A train is moving parallel and adjacent to a highway with a constant speed of 22 m/s. Ini- tially a car is 35 m behind the train, traveling in the same direction as the train at 36 m/s and accelerating at 4 m/s2. What is the speed of the car just as it passes the train? Answer...
*Thursday, October 2, 2014 at 6:32pm*

**physics**

What would be the resultant vector with an angle of 30° with the +x axis and has a y component of 1.2 Newtons?
*Thursday, October 2, 2014 at 6:30pm*

**physics**

Forces of 8.85 N and 2.21 N act at right angles on a stack. What is the mass of the stack if it accelerates at a rate of 4.4 m/s^2?
*Thursday, October 2, 2014 at 6:28pm*

**Physics**

Forces of 9.5 N and 5.12 N act at right angles on a reddish-green block of mass 3.19 kg. How much acceleration occurs?
*Thursday, October 2, 2014 at 6:23pm*

**physics**

A soccer ball is kicked from the ground with an initial speed of 19.4 m/s at an upward angle of 49.8˚. A player 48.5 m away in the direction of the kick starts running to meet the ball at that instant. What must be his average speed if he is to meet the ball just before ...
*Thursday, October 2, 2014 at 6:20pm*

**Physics wavelength question, help please .**

The energy of an X-RAY quantum of wavelength 1.0 X 10^-10 m is. its answer is 1.99 X 10^ -15, but i dont know how to solve it , thanks help please
*Thursday, October 2, 2014 at 6:08pm*

**Physics**

Having trouble on the question below. Would you do need to convert the km to meters and then multiply (4700*9.8*165500)? The first woman in space, cosmonaut Valentina Tereshkova, flew in 1963. She orbited the earth 48 times during her 70 hour 50 minute flight at an average ...
*Thursday, October 2, 2014 at 5:57pm*

**Physics **

A= 2i + 3j - k, B= 4i + 2j - 2k, Find a vector x parallel to A but has magnitude of B ? Answer is √12/7 (2i+3j) - K solve it , i have mcat admission test please solve it
*Thursday, October 2, 2014 at 5:42pm*

**physics**

An object is being thrown upward at 50m How long does it take the object to reach maximum height? What is the maximum height of the object? How much time does it take for the audit to return to its original position? What is the velocity of the object when it hits the ground? ...
*Thursday, October 2, 2014 at 5:06pm*

**physics**

A net force of 5.34 N acting for 4.23 s on a mass initial at rest, causes it to travel 4.75 m in a straight line. What is the mass?
*Thursday, October 2, 2014 at 4:26pm*

**Physics II**

A positively charged particle is moving with a velocity v in a large homogeneous magnetic field. (a) If the field is 4 mT, the mass of the particle is 33·10−9 kg, its initial speed 8.1 m/s, and its charge 6 μC, what is the magnitude of its acceleration? (in m...
*Thursday, October 2, 2014 at 4:01pm*

**Physics II**

The force on the rectangular loop of wire in the magnetic field in the figure below can be used to measure field strength. The field is uniform, and the plane of the loop is perpendicular to the field. Justify the claim that the forces on the sides of the loop are equal and ...
*Thursday, October 2, 2014 at 3:59pm*

**physics**

(a) What is the direction of the force on a wire carrying a current due east in a location where the Earth’s field is due north? Both are parallel to the ground. Answer: Direction of force is Vertically up from ground (b) Calculate the force per meter if the wire carries ...
*Thursday, October 2, 2014 at 3:51pm*

**Physics Constant Force question help.**

A constant force acting on body mass 5 kg changes its speed from 2 m/s to 7 m/s , the direction of motion remains unchanged, find FORCE. answer is 2.5, but help me solve it, thanks
*Thursday, October 2, 2014 at 3:51pm*

**Physics**

A wire carrying a 20.0–A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.47–N force on the 3.10 cm of wire in the field. What is the average field strength?
*Thursday, October 2, 2014 at 3:50pm*

**physics**

I am struggling with this. A wombat of mass 22.0 kg starting at rest slides 13.0 m down a tree at a speed of 5.80 m/s just before reaching the bottom. (a) What is the change in the gravitational potential energy of the wombat during the trip? (b) What is the wombat’s ...
*Thursday, October 2, 2014 at 3:46pm*

**physics**

I am having great difficulty with this question. A block is placed on a frictionless ramp at a height of 12.5 m above the ground. Starting from rest, the block slides down the ramp. At the bottom of the ramp, the block slides onto a frictionless horizontal track without ...
*Thursday, October 2, 2014 at 3:27pm*

**Physics **

An electric rod of 2000 watts rating boils a certain quantity if water in 10 minutes, the heat is generated for boiling this water is? answer is 12 X 10^5 Joules, but I cant solve it please solve it
*Thursday, October 2, 2014 at 3:12pm*

**Physics**

To give a 20-kg child a ride, two teenagers pull on a 3.6-kg sled with ropes, as indicated in the figure. Both teenagers pull with a force of 55 N at an angle of 35 ∘ relative to the forward direction, which is the direction of motion. In addition, the snow exerts a ...
*Thursday, October 2, 2014 at 3:03pm*

**physics**

Three point charges are held at the corners of an equilateral triangle,if q=2 micro columb and length =3cm what is the resultant force on the +q charge
*Thursday, October 2, 2014 at 2:30pm*

**physics intro**

A truck with a mass of 14,0 00 kg is pushed with a force of 9200 N. If the frictional force is 2150 N what is the truck’s acceleration?
*Thursday, October 2, 2014 at 2:03pm*

**Physics 1**

A disk rotates with constant angular acceleration. The initial angular speed of the disk is 2π rad/s. After the disk rotates through 17π radians, the angular speed is 18π rad/s. (a) What is the magnitude of the angular acceleration? answer in rad/s2 (b) How much...
*Thursday, October 2, 2014 at 1:41pm*

**physics**

A box has a mass of 0.345 kg. It is on a very smooth (frictionless) horizontal surface and is acted upon by a force of 3.76 N at an angle of θ = 57.1° with the horizontal. The magnitude of the acceleration of the box is m/s2?
*Thursday, October 2, 2014 at 1:32pm*

**physics**

A snowmobile is pulling a large sled across a snow-covered field. The weight of the sled is 3560 N. If the coefficient of friction of the sled is 0.12, what is the pulling force supplied by the snowmobile?
*Thursday, October 2, 2014 at 1:02pm*

**Physics**

A motor of a certain elevator gives it a constant upward acceleration of 0.767 m/s2, the elevator starts from rest, accelerates for 2s, then continues with a constant speed. a) What is his final speed after 2s? b) Calculate speed after 1 ,and 3 s.? c) How far has it risen 1,2,...
*Thursday, October 2, 2014 at 12:44pm*

**physics**

Explain why the line touches the x-axis at approximately 30oC and 45oC.
*Thursday, October 2, 2014 at 11:30am*

**Physics**

A 2.87 kg object initially moving in the positive x-direction with a velocity of +4.87 m/s collides with and sticks to a 1.96 kg object initially moving in the negative y-direction with a velocity of -2.55 m/s. Find the final components of velocity of the composite object. (...
*Thursday, October 2, 2014 at 10:50am*

**physics**

even if drag force i.e air resistance is greater in magnitude as compared to other force ,there will be no motion in the direction of drag force, right?motion will be still in direction of that 'other force 'but as it is less than drag force there will be deceleration...
*Thursday, October 2, 2014 at 10:21am*

**physics**

direction of drag force i.e air resistance .is it always upward?or like friction force it just concern with opposing motion can be in any direction? in a motion it can be in any direction opposite to direction of motion?
*Thursday, October 2, 2014 at 10:10am*

**physics**

A wagon is rolling forward on level ground. Friction is negligible. The person sitting in the wagon is holding a rock. The total mass of the wagon, rider, and rock is 90 kg. The mass of the rock is 0.26 kg. Initially the wagon is rolling forward at a speed of 0.53 m/s. Then ...
*Thursday, October 2, 2014 at 2:58am*

**physics**

Object A is moving due east, while object B is moving due north. They collide and stick together in a completely inelastic collision. Momentum is conserved. Object A has a mass of mA = 16.7 kg and an initial velocity of nu Overscript bar EndScripts Subscript 0A = 8.32 m/s, due...
*Thursday, October 2, 2014 at 2:58am*

**physics**

Batman (mass = 89.1 kg) jumps straight down from a bridge into a boat (mass = 452 kg) in which a criminal is fleeing. The velocity of the boat is initially +12.9 m/s. What is the velocity of the boat after Batman lands in it?
*Thursday, October 2, 2014 at 2:57am*

**physics**

A lumberjack (mass = 95.7 kg) is standing at rest on one end of a floating log (mass = 218 kg) that is also at rest. The lumberjack runs to the other end of the log, attaining a velocity of +2.54 m/s relative to the shore, and then hops onto an identical floating log that is ...
*Thursday, October 2, 2014 at 2:57am*

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