Force applied Definition and 171 Threads

Homework Statement Okay the first question is: 1. A hockey puck with mass 0.250 kg has initial velocity 3.00 i + 5.00 j m/s just before being hit by a hockey stick. The final velocity after the hit is -37.0 i + 25.0 j m/s. What was the magnitude of the impulse delivered by the stick to...

Homework Statement Water stands at depth d behind a dam of width w . Find an expression for the net force of the water on the dam. Express your answer in terms of the variables w,d,p (density), and appropriate constants. Homework Equations P=F/A or pressure=Force/Area Hydrostatic...

Homework Statement If 1550J of work was done by moving a car a horizontal distance of 127m, what was the force applied to the car?(Assume the force was applied horizontally) Homework Equations Confused The Attempt at a Solution I need to see how its done I am confused

Hi PF, I'm a bit disappointed because the final exam is coming up next Monday and I can't solve this problem. Not that I don't know how to proceed, but I just get a wrong answer. Homework Statement See figure to imagine the situation. This is about a wheel of radius R which contains a circle...

Homework Statement Find the work done when a constant force F is applied to an object that moves along a vector D where units are pounds and feet Homework Equations F= < 64,36 > D = < 22, -33 > The Attempt at a Solution I found magnitude by taking square of 64^2 + 36^2. Cant...

Homework Statement A giant rubber band is going to launch you straight upwards. Upon launch your acceleration is 15 m/s^2 upwards. If your mass is 70 kg, find the force applied to you by the rubber bands. This is a copy word from word of the problem. Please be specific. I have a physics...

A 3.5 kg block (m1) and a 1 kg block (m2) are connected by a string and are pushed across a horizontal surface by a force applied to the 1 kg block as shown below. The coefficient of kinetic friction between the blocks and the horizontal surface is 0.3. If the magnitude of vector F is 27 N...

Homework Statement To move a large crate across a rough floor, you push on it with a force F at an angle of 21°, below the horizontal, as shown in Figure 6-21. Find the acceleration of the crate, given that the mass of the crate is m = 32 kg, the applied force is 344 N and the coefficient of...

Hi, I am taking a correspondence physics course and I've come across a question that I'm not too sure about; I've completed the question but I'm not certain I did it correctly if anyone could please check my answer and correct me if I'm wrong I would really appreciate it! Question: In many...

Ok, I need to calculate the increase in temperature of a nail hit by a hammer with force of 500N. The length of the nail is .06m, so the work done and, I'm assuming, the energy added to the nail (Q) is 30 Joules. The specific heat capacity of the nail is 450 J/kg *C(degrees Celsius). By using...

A 25-kg lawnmover is pushed with a force of 3oN directed 37degrees downward fron the horizontal? a) The acceleration of the lawnmover is b) The upward force exerted by the lawn is Fx= 30 cos(37)= 23.96N Fy= 30 sin(37)= 18N a= 23.96N 25kg = .96m/s^2 b= W=25*...

Homework Statement 0.15 kg baseball is pitched with a speed of 36 m/s (79.2 mph). When the ball hits the catcher's glove, the glove moves back by 4.9 cm (1.96 in.) as it stops the ball. (a) What was the change in momentum of the baseball? 5.4 kg·m/s opposite the ball's direction of...

If a force is applied at centre of mass the object will only translate and not rotate. Can anyone proove this mathematically?

Can someone please explain to me how work is the change in energy, yet if you are applying a force of 100N to a box, and 100N of friction is making the net force zero, how is work being done when the box is already in motion, yet there is no change in kinetic of gravitational potential energy?

Homework Statement Two equal forces are applied to a door. The first force is applied at the midpoint of the door; the second force is applied at the doorknob. Both forces are applied perpendicular to the door. Which force exerts the greater torque? A) The first force at the midpoint of the...

In many neighbourhoods, you might see parents pulling youngsters in a four-wheeled wagon. The child and the wagon have a combined mass of 50kg and the adult does 2.2 x10^3 J of work pulling the two 60m at a constant speed. The coefficient of friction for the surfaces in contact is 0.26...

A 2600 kg block of granite is pulled up an incline which is 36.87 degrees off of the horizontal at a constant speed of 1.07m/s by a cable and winch. The coefficient of kinetic friction between the block and the incline is 0.25. What is the power due to the force applied to the block by the...

How does momentum factor into the force applied to an object at rest hit by another which is moving?

please help! i don't know how to solve da problem please help: Two ropes are used to carry a load of weight 400N. The ropes are 40 degrees to the horizontal. Show that the force applied by each rope is to the container is abou 300N.

Ok, I've been having some real trouble with this problem. Either I’m missing some key piece of reasoning or it’s harder then it seems. ”If a block of mass m is pressed against a vertical surface by a constant force Fh, what are the maximum and minimum angels that that force can be applied...

Im lost on this one & any help whatsoever would be more than appreciated... Here is the problem... You have a block that weighs 70N that rests on a sled that weighs 60N. The coefficient of friction between the box & the sled is .700 & the coefficient of friction between the sled & the ground...