physics 1

1. Rotational Motion and moments of inertia

I have the moment of inertia for the core(initial) and full body(final) but my answer for the moment of inertia for the arms(initial) was incorrect. Arms(initial) moment of inertia:(1/12)(6)(1.7^2)=1.445 this is incorrect for some reason Core(initial) moment of inertia: .9558 Full...
2. A golf ball being hit on the moon vs Earth

I am just not sure if I did this properly. My professor hasn't really gone over when to use the range equation but I would assume range would equal the distance traveled therefore can be used for this problem. If not the how would I go about solving this? I did 1/6*9.8=1.63 for g on the moon...
3. Introduction myself

Hello everyone I'm new here, from South Africa. I am currently studying Beng technology industrial engineering. I am doing physics 1a which kinda giving me a problem.
4. Finding friction and tension for a train

1. Homework Statement A UTA Trax train engine can apply 96050 Newtons and locomotive has a mass of 1750 kg. The passenger car has a mass of 949 kg. (A) If the train accelerates at a rate of 1.29 m/s/s, how much friction is present in the passenger car? (Assume the locomotive...
5. Can we find work done on this particle, and if not, what are we missing?

1. Homework Statement A force varies with time according to the expression F=aΔt, where a = 2.0 N/s. From this information, can you determine the work done on a particle that experienced this force over a displacement of 0.50 m? 2. Homework Equations W = F*d Vf = Vo + aΔt F = ma 3. The...
6. Half Atwood machine: acceleration after inital force

1. Homework Statement Assume that the block on the table (Figure 1) has twice the inertia of the hanging block. (a)You give the block on the table a push to the right so that it starts to move. If the magnitude of the frictional force exerted by the table on the block is half the magnitude of...
7. Calculating the work done from an equation for variable force

1. Homework Statement The force on a particle is directed along an x axis and given by F = F0(x/x0 - 1) where x is in meters and F is in Newtons. If F0 = 1.5 N and x0 = 4.9 m, find the work done by the force in moving the particle from x = 0 to x = 2x0 m. 2. Homework Equations F = force, w =...
8. Other Any physicists that struggled with intro physics?

I’m 3 weeks into my first physics class at college; honors physics 1. I really want to major in physics because it’s really interesting, but I’m finding the class very difficult. Trying to solve the textbook problems and follow the professor’s train of thought is very tough, which is frankly...
9. Work done by gas and balloon?

1. Homework Statement The question is: One kilogram of a gas with a molecular weight of 35 is contained in a balloon. The initial conditions are 27 C and 0.025 m^3. The gas is slowly heated isothermally until the final volume is 0.05m^3. The atmospheric conditions are 100 kPa and 27 C. The...
10. I Torque and Angular Momentum Vector Question.

Hello. I'm currently entering into a Physics II class at the start of my third semester at UCONN (my first semester was introductory modern physics - kinetic theory, hard-sphere atoms, electricity and magnetism, scattering, special relativity, Bohr model, etc), and finished Physics I off with...
11. I Force varying with time?

I'm probably misunderstanding something or have confused my self, but while I was studying for calculus (work integration) I realized that we're always dealing with forces that vary with distance like gravity or a spring force, but what if you have an arbitrary force that varies with time? Like...
12. Moment of Inertia of a Disk

1. Homework Statement A disk of radius R has an initial mass M. Then a hole of radius (1/4) is drilled, with its edge at the disk center. Find the new rotational inertia about the central axis. Hint: Find the rotational inertia of the missing piece, and subtract it from that of the whole...
13. J

Dynamics and Circular Motion Problem

1. Homework Statement A 2 kg tetherball swings around a vertical pole attached to two ropes each at a 30 degree angle from vertical. Each supporting rope is 1.5 meters long, and the ball travels at 8 m/s long. 2. Homework Equations The question doesn't ask what they're looking for, so I...
14. Calculus Need help preparing for Courant's Calculus

Hello, Just to give you some background info, I'm a software developer looking to make a career switch to Mechanical Engineering (At least I think so). My interests lie in design, complex systems, maglev, rockets and new forms of space propulsion. Before I really commit myself to University, I...
15. AP Physics 1 textbook flaw?

1. Homework Statement I'm probably missing something basic here but: The moment of inertia of a body does NOT depend on which of the following? (choose 2 answers) A: The angular acceleration of the body B. The distribution of mass in the body C. The angular velocity of the body D. The axis...
16. Distance an object travels after sliding and falling from roof

1. Homework Statement My physics teacher - "You may like this question, its very structured" Calculate the distance a slate tile falls from a roof The roof is angled at an angle 30 degrees. mass of slate tile is 0.8kg The length of the roof is L=6m The height of the roof above the ground is...
17. Tension problem, check my work?

1. Homework Statement The figure shows two wires that are tied to a 970g mass which revolves in a horizontal circle at a constant 7.5 m/s. What is the tension in the upper wire? The wires are both 1m long, and are attached to a pole. The radius is cos(30 degrees). It's an equilateral...
18. Problem using centripital accel... Can you check my work?

1. Homework Statement A student ties a 500 g rock to a 1.0-m-long string and swings it around her head in a horizontal circle. At what angular velocity in rpm does the string tilt down at a 16 degree angle? 2. Homework Equations F = (m*v^2)/r v = r*w 3. The Attempt at a Solution First I...
19. Air-Track Carts & Spring (Energy)

1. Homework Statement The air-track carts in the figure(Figure 1) are sliding to the right at 2.0 m/s. The spring between them has a spring constant of 140 N/m and is compressed 4.1 cm. The carts slide past a flame that burns through the string holding them together. What is the final speed...
20. Intro Physics projectile problem: Archer fish and grasshopper

HOMEWORK SUBMITTED IN WRONG FORUM, SO NO TEMPLATE I uploaded an image of the problem, it seems to be fairly straight forward. However, my textbook indicates the answer as being 6 m/s, I am consistently getting 3 m/s. Any help would be appreciated!! Because there is no air resistance, the...
21. Simple harmonic motion calculations from doubling the mass.

1. Homework Statement What will the new amplitude be if A=.117m and the mass is 0.1kg. The spring constant is 3.587N/m and the mass is then doubled. What is the new velocity max? What is the acceleration max? 2. Homework Equations Fnet= -kx, vmax=A(ω), ω= √k/m 3. The Attempt at a Solution...
22. Courses My physics 1 & 2 teacher skipped so much material...

I go to a community college for mechanical engineering and I always thought that physics 1 and 2 were way too easy and that my teacher probably skipped a lot of important material. One of my friends just transferred to a university to major in physics and he's been telling me that we didn't...
23. Calculate the distance the sled travels

1. Homework Statement A sled starts with an initial speed of 5.0 m/2 at the top of a 16 meter high ski jump. The ski jump makes an angle of 53 degrees relative to the horizontal. There is a coefficient of kinetic friction of 0.5 between the sled and the ski jump. Calculate the distance from the...
24. The block and spool problem (dynamics of rigid bodies)

1. Homework Statement A block and spool are each pulled by a string across a frictionless surface. The string is wound around the spool such that it may unwind as it is pulled, the string attached to the block is at the center of mass. The block and spool have the same mass and the strings...
25. Angular Acceleration

1. Homework Statement This is not really a question on how to solve the problem, I'm just trying to get clarification on something. For angular acceleration, α, can someone explain to me what αz is? And why does αz = α / R = αy? I understand the rest of the problem, I just don't understand...
26. Finding velocity and momentum of a bullet and recoiling gun

1. Homework Statement A bullet leaves the barrel of a gun with a kinetic energy of 90 J. The barrel of the gun is 50 cm long. The gun has a mass of 4 kg, the bullet 10 g. (a) Find the bullets final velocity. (b) Find the bullets final momentum. (c) Find the momentum of the recoiling gun. (d)...
27. Can someone give me some hints for this incline problem?

I am sorry, I generally would show some work but I have no clue on how to start off to find angle theta. The answer is given below and I have to get it. I don't know at all how to approach this problem and unfortunately I am not too strong on my trig identities either but I will try. May some...
28. Tension on blocks on ramp

1. Homework Statement The ramp in figure is frictionless. If the blocks are released from rest, which way does the 10 kg block side and what is the magnitude of its acceleration? θ=40°...
29. College physics problem -- Find gravitational acceleration

1. Homework Statement Here's the question: As space colonization expands, it's important to build new stations from local materials instead of bringing everything from Earth. Your latest task (besides asking for a raise) is to check the long-term stability of a proposed configuration of...
30. Finding the total distance traveled by the body at interval

1. Homework Statement At time t, the position of a body moving along the s-axis is s= t^3 -12t^2 + 36t m(meters) Find the total distance traveled by the body from t = 0 to t = 3. 2. Homework Equations Derivatives 3. The Attempt at a Solution I got the derivative which is 3t^2 - 24t +...