Bullet Definition and 645 Threads

Homework Statement A person is standing on a train that is moving 200 km/h to the right. The person fires a bullet that travels 200 km/h opposite the direction of the train's movement. How fast is the bullet moving according to the shooter's perspective (assuming there is no gravity, resistive...

So, I was thinking a while ago about force fields. Don't stop reading though, hear me out. It occurred to me that you could change the course of a bullet in midair if you had a sufficiently powerful electric or magnetic field. The problem, of course, is that it is probably not economically...

Homework Statement A 30g rifle bullet traveling 220 m/s buries itself in a 3.0kg pendulum hanging on a 2.1m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of the pendulum's maximum displacement. Homework Equations p=mv...

Homework Statement A 7.8g bullet moving at 575m/s penetrates a tree trunk to depth of 5.50cm. (a) Use work and energy considerations to find the average frictional force that stops the bullet. (b) Assuming that the frictional force is constant, determine hot much time elapses between the...

Homework Statement A 5.0g bullet leaves the muzzle of a rifle with a speed of 320 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.82 m long barrel of the rifle? Homework Equations \SigmaF=ma The Attempt at a Solution

Homework Statement An 8.37g bullet is fired into a 235g block that is initially at rest at the edge of a table of h = 1.18 m height (see the figure below). http://schubert.tmcc.edu/res/ohiou/serwaylib/Graphics/Graph06/serw0626.gif The bullet remains in the block, and after the impact the...

Homework Statement Consider a bullet of mass m fired at a speed of V0 into a wooden block of mass M. The bullet instantaneously comes to rest in the block. The block with the embedded bullet slides along a horizontal surface with a coefficient of kinetic energy \mu. How far does the block...

A bullet with mass m and velocity v, penetrates a mass M suspended on a piece of string length R. The bullet loses half of its velocity in the impact and carries on in a straight line. What must the minimum magnitude of v be so that the mass would spin a full circle. p = mv, 1/2mv^2...

Homework Statement A hunter aims his gun at a monkey hanging from a high tree branch some distance away. At the instant the gun is shot the monkey drops from the branch, hoping to avoid the bullet. Assume there is no air resistance. Show analytically, using variables, that the monkey made the...

Homework Statement The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-4.80 107) t 2 + (2.45 105) t, where v is in meters per second and t is in seconds. The acceleration of the bullet just as it leaves the barrel is zero. (a) Determine...

Homework Statement A bullet of mass 0.125 kg traveling horizontally at a speed of 150 m/s embeds itself in a block of mass 2.5 kg that is sitting at rest on a nearly frictionless surface. What is the speed of the block after the bullet embeds itself in the block? Homework Equations...

I have been working on this problem for an hour and have no clue what to do. I try to use equations such as v = v0 + at Velocity as a function of time delta x = (v0)(t) = 1/2(a)(t^2) Displacement as a function of time v62 = v0^2 + 2(a)(delta x)...

Homework Statement Derive a formula for the bullet speed v in terms of D, T, and a measured angle theta between the position of the hole in the first disk and that of the hole in the second. If required, use pi, not its numeric equivalent. Both of the holes lie at the same radial distance from...

Hey guys, I confused about something,please help me. I have a bullet and its diameter is 0.5 inches. its speed is 400 foot /sec. It makes one complete rotation in the gun 120 mm per turn and length of the gun is 1.5 meter. How can I calculate the rotational and angular speed? -I used a...

Hi! Could someone please check if my following problems are correct? Any insight on why a problem is incorrect would be appreciated. Thanks! 1) An object is hung from a light vertical helical spring that subsequently stretches 2.0 cm. The body is then displaced and set in SHM. Compute the...

Homework Statement A 2.5 g bullet, traveling at a speed of 425 m/s, strikes the wooden block (mass = 215 g) of a ballistic pendulum. (A) Find the speed of the bullet/block combination immediately after the collision. (B) How high does the combination rise above its initial position...

Is kinetic energy or momentum a better indicator of bullet penetration?

Homework Statement A 7.0-g bullet is fired into a 1.5-kg ballistic pendulum. The bullet emerges from the block with a speed of 200 m/s, and the block rises to a maximum height of 12.6 cm. Find the initial speed of the bullet. Homework Equations The Attempt at a Solution I used the...

Homework Statement A 10g bullet is traveling at a speed of 1.5*10^2 m/s parallel to a horizontal surface when it strikes a 5.5kg wooden block. If the bullet becomes lodged in the block, how far will the block move along this surface? The coefficient of friction between the block and the...

Homework Statement A bullet is fired from a cliff 36m above the ground. If the bullet is fired at an angle of 25 above the horizontal, and has a muzzle velocity of 80m/s, what is the velocity of the bullet as it hits the ground? d = 36m vi = 80m/s angle = 25 degrees Homework Equations...

Homework Statement A bullet is shot at initial velocity of 600m/s at an angle of 30 degrees. How far will it travel before landing? (Assume no air resistance) v=600m/s a=9.8m/s^2 t=? distance=? Homework Equations x=x0+v0t+1/2at^2 The Attempt at a Solution I'm stuck on this...

Homework Statement A Block of mass M is attached to a cable of length L. It is initially held at the horizontal position at rest. It is then released in the motion of a pendulum and collides with a bullet of mass m, traveling at a speed of Vi, at the lowest point of its trajectory. The...

Help needed with the effect of "no time"/"time freeze" on bullet movement 1.There is a special question in our assignment:Assuming a person is able to freeze time, will he be able to shoot a bullet from a gun? 2. There are no real equations I know except for the standard distance = speed X...

Homework Statement so this is a classic problem...if you know what i mean. The speed of a moving bullet can be determined by allowing the bullet to pass through two rotating paper disks mounted a distance .082m apart on the sam axle. from the angular displacement 24.9 degree of the two...

Homework Statement A 7 g bullet is fired into a 13.43 kg wood block that is at rest on a wood table. The block, with the bullet embedded, slides 5.92 cm across the table. What was the speed of the bullet? Homework Equations Ki=Kf ma=N+mg+fs Xf=Xi+(Vf^2-Vi^2)/2a The Attempt at a...

Homework Statement You have been asked to design a "ballistic spring system" to measure the speed of bullets. A bullet of mass 6.20 g is fired into a block of mass 2.10 kg. The block, with the embedded bullet, then slides across a frictionless table and collides with a horizontal spring...

Homework Statement A rifle with a barrel length of 50.86 cm fires a 7.06 g bullet with a horizontal speed of 449 m/s. The bullet strikes a block of wood and penetrates to a depth of 12.9 cm. What resistive force (assumed to be constant) does the wood exert on the bullet? 5516.6785...

1. Homework Statement [/b] A rifle with a barrel length of 61.54 cm fires a 8.17 g bullet with a horizontal speed of 400 m/s. The bullet strikes a block of wood and penetrates to a depth of 8.9 cm. What resistive force (assumed to be constant) does the wood exert on the bullet...

I'm trying to disprove the movie Wanted for a less than obvious reason. In the final scene a .45 ACP round travels through 11 human heads. I was curious of how I could mathematically disprove this being possible. Would I use the energy of the bullet or the force? and with either, how would I go...

A 35.0-g bullet strikes a 4.7-kg stationary piece of lumber and embeds itself in the wood. The piece of lumber and bullet fly off together at 8.0 m/s. What was the original speed of the bullet? I don't know where to begin...

Homework Statement A rifle bullet of mass 7.2 grams strikes and embeds itself in a block with mass 0.819 kg that rests on a frictionless horizontal surface and is attached to a coil spring. The impact compresses the spring 17 centimeters. Calibration of the spring shows that a force of 0.68...

Homework Statement A bullet of mass 0.010 kg and speed of 100 m/s is brought to rest in a wooden block after penetrating a distance of 0.10 m. This process takes 0.02 seconds. Theblock remains stationary during this process. a. what is the magnitude of the impulse delivered to the bullet...

Homework Statement A 0.028 kg bullet is fired vertically at 185 m/s into a 0.15 kg baseball that is initially at rest. The bullet lodges in the baseball and, after the collision, the baseball/ bullet rise to a height of 37 m. (a) What was the speed of the baseball/bullet right after the...

Homework Statement A 7.00 g bullet, when fired from a gun into a 1.00 kg block of wood held in a vise, penetrates the block to a depth of 7.40 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 bullet of mass 0.125 kg traveling horizontally at a speed of 250 m/s embeds itself in a block of mass 3.5 kg that is sitting at rest on a nearly frictionless surface. (a) What is the speed of the block after the bullet embeds itself in the block? v = ? m/s (b)...

Homework Statement In a ballistics test, a 25 g bullet traveling horizontally at 1200 m/s goes through a 35 cm thick 350 kg stationary target and emerges with a speed of 850 m/s. The target is free to slide on a smooth horizontal surface. (a) How long is the bullet in the target...

Homework Statement A bullet with mass of 0,005g hits a wooden block with a mass of 1,2kg. The bullet and the block move 0,3meters after the collision, friction coefficient is 0,2 between the ground and the block. Find out velocity of the bullet. Trying to study for exams, but got stuck in...

Homework Statement A wooden block of mass M resting on a frictionless horizontal surface is attached to a rigid rod of length l and of negligible mass. The rod is pivoted at the other end. A bullet of mass m traveling parallel to the horizontal surface and perpendicular to the rod with speed v...

1. A 9.05- g bullet from a 9-mm pistol has a velocity of 331.0 m/s. It strikes the 0.705- kg block of a ballistic pendulum and passes completely through the block. If the block rises through a distance h = 19.47 cm, what was the velocity of the bullet as it emerged from the block? i know that...

Homework Statement I am going through past Olympiad qualifying exams as practice for this year's test. I came upon the following problem in the 2008 F=ma and continue to come up with the wrong answer. I keep coming up with C and that is not the answer provided in the answer key. 22. A...

Homework Statement 2 kg block of wood rests on a long tabletop. A 5g bullet moving horizontally with a speed of 150m/s is shot into the block and sticks into it. The block then slides 270cm along the table and stops A) find the speed of the block ( answer: 0.374 m/s) B)*** find the...

Homework Statement A 15g bullet strikes and becomes embedded in a 1.10kg block of wood placed on a horizontal surface just in front of the gun. If the coefficient of kinetic friction between the block and the surface is .25, and the impact drives the block a distance of 9.5m before it comes...

Homework Statement A 1.08 kg block is attached to a horizontal spring with spring constant 3650 N/m. The block is at rest on a frictionless surface. A 10.6 g bullet is fired into the block, in the face opposite the spring, and sticks. What was the bullet's speed if the subsequent...

Homework Statement A gun designed to shoot with speed 630 m/sec Find: a) from which point above the goal must the hunter shoot to catch an animal, if the horizontal distance between them is 700 meter ? b) What is the max high for the bullet ? c) what is the time bullet take to get at the...

I'm doing a co-op with a major tech company right now and I need help with one bullet point I was thinking about. Is it worth to mention that I worked with designers on a daily basis in two different locations: one within the US and another one elsewhere in the world? I already have a job...

Homework Statement A bullet with a mass of 6.00 g is fired through a 1.25 kg block of wood on a frictionless surface. The initial speed of the bullet is 896m/s, and the speed of the bullet after it exists the block is 435 m/s. At what speed does the block move after the bullet passes through...

Homework Statement A 20 gram bullet strikes a 15 kg mass attached to a spring. The mass aslides and compresses the spring by 12 cm. Calculate the velocity of the bullet initially. Bullet......Mass...Spring ...D.......I--------I ........I...I~~~~~~~~| ......_____I_______I___________|...

A bullet of mass m_1 strikes a pendulum of mass m_2 suspended from a pivot by a string of length L with a horizontal velocity v_0. The collision is perfectly inelastic and the bullet sticks to the bob. Find the minimum velocity v_0 such that the bob (with the bullet inside) completes a circular...

Trajectory of a bullet with drag In most physics books, they pass over drag problems because of their difficulty. However, I had to do one for a mid-term for a physics class. When the velocity is low (tens of m/s or less), then the drag is proportional to the velocity and the math is quite...

Homework Statement A 20.0 g bullet moving horizontally at 70.0 m/s strikes a 9.00 kg block of wood lying at rest on the pavement. The bullet embeds itself in the block of wood during the collision. Find a. the speed of the block of wood immediately after the collision, b. the...