Block Definition and 998 Threads

1. I have to create an exercise to calculate the velocity of a block of wood (m=1,5 kg). A bullet passed through a block that was on a table also made of wood. What I really want to calculate is the initial velocity of the bullet, but, in order to do that, I need to know the velocity of the...

Homework Statement A block released from height h hits a spring with constant k, the box compresses the spring a distance x then returns to the same height. Find the maximum speed of the block. Homework Equations K=1/2mv2 U=mgh The Attempt at a Solution This solution was provided...

Homework Statement A block starts from rest at the top of a 31.0 degree inclined plane and encounters a spring, of constant 3.4 kN/m, rigidly attached to the plane. If the block's mass is 33.0 kg and it compresses the spring by 37.0 cm, find the distance the block traveled before it...

Homework Statement A wooden block is on an incline with θ = 18.5 degrees. The angle was determined to be big enough that the wooden block would experience kinetic friction ( slides down the ramp). A photo-gate was used to measure the time it took for the block to move a certain distance. Five...

Homework Statement A cubical block of side L rests on a fixed cylindrical drum of radius R. Find the largest value of L for which the block is stable. Homework Equations The Attempt at a Solution There is only one contact point between the cube and cylinder. There are three forces...

Homework Statement A small block is standing on top of a big smooth sphere. The small block is initially at rest. The block then glides down the sphere. The block is standing a little to the side for it to move down the sphere but it can be assumed that it is starting at the top. The radius...

Homework Statement A block of mass 1kg has a coefficient of static friction of .5. If a 7N force is applied to the block what distance can the block travel? Coefficient of kinetic friction is .3 Homework Equations F=ma The Attempt at a Solution I found the static frictional force...

If it takes 30N to tip over a block based on the equation F=mgL/2r but you strike the stationary block with a force of 50N what is the equation for the force of the block as it is tipping? I know that there will be an Fnet force of 20N but wouldn't a force of gravity or something give the...

I have an argument with classmates about the trajectory that the block will have (circle, ellipse, something else...). The configuration is similar to this image. http://minireference.com/_media/physics/momentum-bullet-speed-block.jpg?w=400 Initially, the block will move horizontally...

Sorry if I am posting this in the wrong place but this is my first post. I know the equation for tipping of a block when force is slowly added until it either tips of slides is umg=mgL/2h but I have noticed that when you quickly strike the block with your finger, the point at where the block...

Homework Statement Block A sitting on top of block B has a mass mA = 10 kg and is attached to the wall by mass less string. Block B, mass mB = 35 kg, is pulled by a force F = 80 N. The surface under block B is frictionless. If the coefficients of friction for block A and B areμs = 0.4 and...

Homework Statement A 7.00 g bullet, when fired from a gun into a 1.10 kg block of wood held in a vise, penetrates the block to a depth of 6.40 cm. This block of wood is next placed on a frictionless horizontal surface, and a second 7.00 g bullet is fired from the gun into the block. To what...

Homework Statement A 700 g block is released from rest at height h0 above a ver- tical spring with spring constant k = 400 N/m and negligible mass. The block sticks to the spring and momentarily stops after com- pressing the spring 19.0 cm. What is the value of h0? Homework Equations W =...

Homework Statement This isn't strictly homework, but the nature of my problem is similar to homework problems: A block with mass m and it's center of mass not necessarily at the center is sliding along a frictionless surface. The center of mass is distance r from the right front corner of...

Homework Statement A .500 kg block rests on a horizontal, frictionless surface as in the figure below. The block is pressed back against a spring having a constant of k=625 N/m, compressing the spring by 10cm to point A. Then the block is released. a) Find the maximum distance d the block...

Homework Statement It's in the picture attached... Homework Equations None... The Attempt at a Solution I picked options 2, 5 and 7 to be true but 2 turned out to be false. I can't figure out why it's wrong and an explanation would be appreciated. I mean it makes sense to me because work...

Homework Statement A block with mass 2.90kg is attached as shown to a spring with a force constant of 492.0N/m. The coefficient of kinetic friction between the block and the surface on which it slides is 0.170. The block is pulled 5.30cm to the right of its equilibrium position and then...

Homework Statement A string is tied to a 4.4 kg block and 120g hanging bucket. Students add 20g washers one at a time to the bucket. The student are unaware that the coefficient of static friction for the block on the table is 0.42. A) what is the maximum force of static friction for the...

Homework Statement A wedge of mass M rests on a horizontal table. A block of mass m rests on the wedge. http://imgur.com/cS02MvM (a) What horizontal acceleration, a, must M have relative to the table to keep the block stationary relative to the wedge, assuming no friction? (b) What...

Say there is a block that moves to the right. After a distance it hits a spring, and then it compresses the spring. Does this mean that the work that the spring does on the block is positive or negative? I would say it is negative because the block compresses the spring, so the displacement...

Homework Statement physical reasons for the relationship between weight change(100CC beaker with water and when you dip aluminum block in water ) and apparent loss in weight of the aluminium (Aluminium block weight using spring balance and when that block immersed in water) Homework Equations...

Homework Statement A bar of soap of mass m is at rest on a frictionless square plate of side-length D rests on a horizontal table. At t=0 I start to raise one edge of the plate the plate pivots about the opposite edge. The angular velocity about the pivot is a constant ω Show that the...

A 1.0 kg wood block is pressed against a vertical wood wall by a 12 N force (into the wall, at a 30 degrees angle up from the horizontal). if the block is initially at rest, will it move upward, move downward, or stay at rest? I'm working on the problem above, and through Google found this...

Homework Statement You are pushing four blocks of masses 4, 7, 11, and 17kg positioned next to each other on a frictionless surface. Find the force of contact between the 7 and 11kg blocks when you push the blocks with a 190N force to the left. They are arranged as such: |17||11||7||4|...

Homework Statement A block of mass m starts from rest at a height h and slides down a frictionless plane inclined at angle θ with the horizontal, as shown below. The block strikes a spring of force constant k. Find the distance the spring is compressed when the block momentarily stops...

Homework Statement A block of mass 0.80 kg rests on the inclined surface of a wedge of mass 2.0 kg. The wedge is acted on by a horizontal force F and slides on a frictionless surface. If the coefficient of static friction between the wedge and the block is µs = 0.40, and the angle of the...

Homework Statement A 400g steel block rotates on a steel table while attached to a 1.20m -long hollow tube. Compressed air fed through the tube and ejected from a nozzle on the back of the block exerts a thrust force of 4.71N perpendicular to the tube. The maximum tension the tube can...

Homework Statement "Figure 1 shows two wedge blocks A and B, weighing 1000 N and 50 N, respectively, in contact. The coefficient of friction between all contacting surfaces is 0.1 . What would be the smallest value of P required to push the block A upwards? What would be its value if there...

Homework Statement A metal block of mass m slides on a horizontal surface that has been lubricated with a heavy oil so that the block suffers a viscous resistance that varies as the 3/2 power of the speed: F(v) = -cv3/2 If the initial speed of the block is vo at x = 0, show that the block...

1. A block of mas M=17kg is suspended by three ropes as shown in the figure. The two ropes attached to the ceiling each make an angle of 41° with the horizontal a)What is the tension T2 in the vertical rope? b)What is the tension 1 in the ropes attached to the ceiling?Homework Equations F=ma3...

Block A, with weight 3w, slides down an inclined plane S of slope angle 36.9 ∘ at a constant speed while plank B, with weight w, rests on top of A. The plank is attached by a cord to the wall (the figure (Figure 1) ). Part A Draw a diagram of all the forces acting on block A. Draw the force...

Homework Statement A 2.0 kg wood block is launched up a wooden ramp that is inclined at a 30∘ angle. The block's initial speed is 10m/s. The coefficient of kinetic friction of wood on wood is μk=.200. What vertical height does the block reach above its starting point? The answer is...

Homework Statement In a crash test a solid concrete wall is used to test crashworthiness. A particular SUV weighs 338.183 kg and is accelerated to 33.3485 m/s before colliding head on with the barrier. What impulse must be applied is required to stop the SUV? This gives Impulse =...

Homework Statement A block at t=0 is at the bottom of the plane and is projected up an inclined plane with initial speed v0. The plane's acute angle is θ above the horizontal, and the coefficient of friction is μ between the block and plane. Find the time (t) and velocity (v1) of the...

Homework Statement The block shown in the drawing is acted by a spring with spring constant ##k## and a weak friction force of constant magnitude ##f##. The block is pulled a distance ##x_0## from equilibrium and released. It oscillates many times and eventually comes to rest. a. Show that the...

Physics Help Greatly Appreciated -- Block sliding down ramp A 7.7 kg block is on an incline with a coefficient of static friction of 0.50. The angle that the ramp makes with the horizontal is increased gradually, until the block begins to slide down the ramp. If you know that the coefficient of...

Hi, I'm having trouble with a conceptual problem: Homework Statement There is a block of wood in a jar with water; it is floating. If I pour oil into the container, obviously the oil sits at a layer above the water. The wooden block touches the water, oil and air now. Did the volume of the...

Homework Statement A textbook of mass m = 1.24 kg starts at rest on a frictionless inclined plane (angle  = 30◦). Although there is no friction, suppose there is a drag force (due to air resistance) acting on the book which is proportional to the speed squared and is described by the...

Homework Statement In the figure, a slab of mass m1=40kg rests on a frictionless floor, and a block of mass m2=10kg rests on top of the slab. Between block and slab, the coefficient of static friction is μs=0.60, and the coefficient of kinetic friction is μk=0.40. A horizontal force F of...

Homework Statement a block of mass m = 1.62kg slides down a frictionless incline.the block is raised a height h = 3.91m above the bottom of theloop. (a) what is the force of the inclined track on the block atthe bottom (point A)? (b) what is the force of the track on the block at pointB...

Imagine a surface that rotates with frequency f about its center, if we set a small block (or a coin, or any flat object for that matter) on the table, I wanted to calculate the maximum radius that you can place this block from the center before it starts to move outward from the center. This is...

This question is about this video on YouTube, in which a bullet is fired vertically into the center of a wooden block from below, sending the block up into the air. Next, a bullet is fired vertically but off-center into a similar block from below, again causing the block to rise into the air...

As I understand, complementarity approach claims that there are 2 different stories, for an infalling observer and an observer @ infinity, they are different, but no observer can confirm both. But it violates the Block Time/Eternalism, where time is a dimension, the whole world is a static...

Homework Statement A block A of mass m is placed over a wedge B of same mass m. Assuming all surface to be smooth. The displacement of block A is 1 sec if the system is released from rest is : Homework Equations The Attempt at a Solution i have made fbds and have the relations-...

Hello, I'm trying to design a simple digital circuit for learning purpose, and maybe later a bigger project. The idea is to interface a microprocessor, probably a pure combinational logic block to do simple stuff, with a memory chip. Now what I need is a way to make sure that when I send an...

Homework Statement A box of mass M is at rest on a horizontal table. The coefficient of static friction between the box and the table is k. The box is connected by a taut string to a block of unknown mass m , initially held horizontally as shown and then released. The box begins to slide at...

Homework Statement What value(s) of θ will result in the block being accelerated 9.0m/s2 to the right? Homework Equations ƩFx = max N = mg - P sin(θ) The Attempt at a Solution P cos(θ) - μkN = max P cos(θ) - μk(mg - P sin(θ)) = max P cos(θ) + μk P sin(θ) = max + μkmg cos(θ) +...

Homework Statement A block of mass 2.5 kg is placed against a compressed spring (k = 2900 N/m) at the bottom of an inclined plane. When the spring is released the block is projected up the incline and the spring expands by 14 cm to its normal length. Calculate the maximum distance traveled by...

i have a cheap polarizing shade i bought from walmart. i aligned my polarizing shades with the polarized light coming from my laptop, however not all the light was blocked. just to be extra sure that it wasn't my lcd that was being weird, i rotated a laser beam through my polarizing shades, and...

Homework Statement A box of mass M is at rest on a horizontal table. The coefficient of static friction between the box and the table is k. The box is connected by a taut string to a block of unknown mass m, initially held horizontally as shown and then released. The box begins to slide at the...