F.B

I am stuck on part b of this question. 2. A 0.20 kg mass is hung from a vertical spring of force constant 55 N/m. When the spring is released from its unstretched equilibrium position, the mass is allowed to fall. Use the law of conservation of energy to determine a)The speed of the mass after it falls 1.5 cm b)The distance the mass will fall before reversing direction. How do we determine the maximum stretch. I know how to do a) but i dont kno how to do b). The answer for a is 0.48 m/s. Can someone please help me.

if i do Ee=Ek and determine the speed. What do i do with how can i find the distance

I really need help because i have a test tomorrow. A student uses a compressed spring of force constant 22 N/m to shoot a 0.0075 kg eraser across a desk. The magnitude of the force of friction on the eraser is 0.042 N. How far along the horizontal desk will the eraser slide if the spring is initially compressed 3.5 cm. Use the law of conservation of energy. I know i have to find the speed and acceleration but i dont get the right answer. For speed i did Ee=Ek and then the answer i get is 1.89 m/s i think thats right. But for acceleration im not sure.I did this: Fnet=Fe-Ff ma=kx-Ff and then i end up getting 97 m/s^2 i think thats wrong. Oh can you also help me with this question, it doesnt involve calculations. Which has more kinetic energy a slow moving car or a fast moving truck. I think its the truck because the formula is Ek=1/2mv^2 but there has to be a catch to it.

I really don't like this unit mostly because i dont understand it. So can anyone please explain how to do this question i really need help. Determine the magnitude and direction of the gravitational force exerted (a) on the Moon by Earth and (b) on Earth by the Moon. I dont know how to do this, can anyone please explain how to do this question. Also are they looking for g or FG.

I am really stuck on this question i just got part a of it and now b is left. Mu= Weird friction symbol A box of a mass m=22 kg is at rest on a ramp inclined at 45 degrees to the horizontal. The coefficient of friction between the box and the ramp are "Mu s" = 0.78 and "Mu k" = 0.65. b) Determine the magnitude of the smallest force that can be applied onto the top of the box, perpendicular to the ramp, if the box is to remain at rest. Im having trouble drawing the Fapp arrow, so its messing with my equations. I'll post what i did so far. Fn= Fgy - Fapp Fnet=0 Fnet= Fgx - Ffs i'm pretty sure my Fnet equation is right. But i dont know about my Fn. So can anyone please tell me if those are the right equations.

ya i just figured that out now. thx. But i have another question that i am stuck on that's a bit harder. I'll post it right here instead of making a new topic. An adult is pulling two small children in a sleigh over level snow. The sleigh and children have a total mass of 47 kg. The sleigh rope makes an angle of 23 degrees with the horizontal. The coefficient of kinetic friction betwen the sleigh and the snow is 0.11. Calculate the magnitude of the tension in the rope needed to keep the sleigh moving at a constant velocity. (Hint. The normal force is not equal to the force of gravity.) I don't know what to figure out first. See i need Fn but i can't figure it out. I think Fn=Fg - Fapp(in the y direction). But i dont have a force to help me out.

I need help with this question please. A skier on a slope inclined at 4.7 degrees to the horizontal pushes on ski poles and starts down the slop. The initial speed is 2.7 m/s. The coefficient of kinetic friction is between the skies and snow is 0.11. Determine how far the skier will slide before coming to rest. This question doesnt have mass, it doesnt have acceleration. I don't how to find Fnet. Can anyone please help me start this question.

another quick question. If in one of the questions it says the frequency is 10 s^-1 what does that mean??

I need help with a question on my lab, im used to finding proportionality statements between sets of data and graphing it to get a straight line. But this question is different. Anyways heres the data i have. Oh ya the lab is on Centripetal Force frequency/Force 1.02 / 5 1.33 / 10 1.65 / 15 1.87 / 20 The slashes just separate the numbers so they dont bunch up. Here the question i need help on. Rearrange the data for the frequency in such a manner as you think will result in a straight line when plotted. Plot this data on graph paper#2. What is the equation for this relationship by calculating the constant of proportionality.

Does anyone know any other forums that will help you pick topics for an essay? I have to write a comparative essay on the Handmaid's Tale and 1984. I don't really know what to write. Of course i have really finished reading the Handmaid's tale, but i want to pick a topic now so i can look for quotes. So can anyone please help me?

I really need help on these types of questions. So please help if you can. A swimmer who achieves a speed of 0.75 m/s in still water swims directly across a river 72m wide. The swimmer lands on the far shore at a position 54 m downstream from the starting point. (a) Determine the speed of the rivers current (b)Determine the swimmers velocity relative to the shore ©Determine the direction the swimmer would have to aim to land directly across from the starting position I have no clue on how to start this question because they give us speed when they want velocity. So can anyone please help me start this question

that velocity is horizontal so it doesnt really do anything with the gravity. The confusing part for me are the two heights. Do i find the difference or add them

Ahh sorry im already stuck on a question. I just need help getting started. Anyways this is the question A tennis player serves a ball horizontally, giving it a speed of 24 m/s from a height of 2.5 m. The player is 12 m from the net. The top of the net is 0.90 m above the court surface. The ball clears the net and lands on the other side. Air resistance is negligible. a)For how long is the ball airborne? b)What is the horizontal displacement? c)What is the velocity at impact? d)By what distance does the ball clear the net. I have no idea how to start this. I dont even know what i have. Can you please help me.

I need help on projectile motion questions because i had to miss a whole lesson for some reason and my teacher said to try some of the questions. Anyways im stuck on this question. A cannon is set at an angle of 45 degrees above the horizontal. A cannon ball leaves the muzzle with a speed of 220 m/s. Air resistance is negligible. Determine the cannonball's a) maximum height b) time of flight c) horizontal range (to the same vertical level) This is what i did. Im not going to do step by step on the part i got. Before these i started i found VIx which is 155.6 m/s and Viy is the same a) At max height Vfy=0( i dont get why but i know thats how you do it) 2ad=Vi^2 + Vf^2 d= (155.6)^2/-2(-9.8) d= 1240m b)i have no idea how to get this one i hope you can help me. c)i started but i couldnt finish. This is what i did d=Vit + 1/2a(t^2) 1240=155.6t - 4.9t^2 4.9t^2 - 155.6t + 1240 = 0 I know i need to do the quadratic formula after this but i get a negative within the radical so i dont know what to do i think i made a mistake somewhere. Can you please help me?

I am now doing acceleration due to gravity. And i am confused about something. I'll just write down the question. A hot-air balloon is moving with a velocity of 2.1 m/s [uP] when the balloonist drops a ballast (a large mass used for height control) over the edge. The ballast hits the ground 3.8s later. How high was the balloon when the ballast was released? This is what i did. d=Vit + 1/2at^2 d= -2.1(3.8) + 1/2(9.8)(3.8)^2 This is supposed to work but i dont get why we are using 3.8s as the time because at 3.8s the distance/displacement is 0. So how come this works. Can anyone please explain this.