1. You hold a 4.0-kg computer. part A) Determine the magnitude of the torque exerted on...

1. You hold a 4.0-kg computer.

part A)

Determine the magnitude of the torque exerted on your forearm about the elbow joint caused by the downward force exerted by the computer on the forearm. Let the distance between the center of mass of the computer and your elbow joint be 0.25 m. Ignore the mass of the arm.

part B)

Determine the magnitude of the torque exerted on your forearm about the elbow joint caused by the upward 340-N force exerted by the biceps muscle on the forearm. Let the biceps muscle be 0.030 m (about 3.0 cm) from the joint.

2. You hang a light in front of your house using an elaborate system to keep the 12-kg object in static equilibrium (Figure 1) . What are the magnitudes of the forces that the ropes must exert on the knot connecting the three ropes if θ2 = 63∘ and θ3 = 45∘?

part A) Determine the magnitude of the force that rope 1 must exert on the knot

part B) Determine the magnitude of the force that rope 2 must exert on the knot.

part C) Determine the magnitude of the force that rope 3 must exert on the knot.

3. A tightrope walker wonders if her rope is safe. Her mass is 60 kg and the length of the rope is about 20 m. The rope will break if its tension exceeds 4300 N.

What is the smallest angle at which the rope can bend up from the horizontal on either side of her to avoid breaking?

4. The fulcrum of a uniform 20-kg seesaw that is 4.0 m long is located 2.5 m from one end. A 38-kgchild sits on the long end. Determine the mass a person at the other end would have to be in order to balance the seesaw.

5. A board of mass m and length l is placed on a horizontal tabletop. The coefficient of static friction between the board and the table is μ. How far from the edge of the tabletop can one extend the board before it falls off?

Expert Solution

genius_generous answered 2 years ago

In each hand you hold a 0.17-kg apple. What is the gravitational force exerted by each...

In each hand you hold a 0.17-kg apple. What is the gravitational force exerted by each apple on the other when their separation is each of the following? (a) 0.40 m _______ N (b) 0.80 m _______ N A communications satellite with a mass of 500 kg is in a circular orbit about the Earth. The radius of the orbit is 46,000 km as measured from the center of the Earth. (a) Calculate the weight of the satellite on the...

QUESTION 1 [13] Suppose that due to a gravitational torque exerted by the Moon on the...

QUESTION 1 [13] Suppose that due to a gravitational torque exerted by the Moon on the Earth, our planet's rotation slows at a rate of 1.30 ms/century (see picture below). Show the full calculations, including the conversions. Do not round up in intermediate calculations. HINT: You will need to use basic definitions of: alpha, Δω, Δθ, and Δt to crack the problem. (a) Calculate the Earth's angular acceleration due to this effect. (8) (b) Calculate the torque exerted by the...

A 1-kg wooden branch floats on the surface of a freshwater lake. a) Determine the magnitude...

A 1-kg wooden branch floats on the surface of a freshwater lake. a) Determine the magnitude of the buoyant force on the branch b) Determine the volume of water (in m displaced by the branch.

Give a more general expression for the magnitude of the torque T. Rewrite the answer found in Part A in terms of the magnitude of the magnetic dipole moment of the current loop m.

Give a more general expression for the magnitude of the torque T. Rewrite the answer found in Part A in terms of the magnitude of the magnetic dipole moment of the current loop m. Define the angle between the vector perpendicular to the plane of the coil and the magnetic field to be ф, noting that this angle is the complement of angle θ in Part A. Give your answer in terms of the magnetic moment m, magnetic field B, and...

Determine whether the computer system on which you are working is part of a local area...

Determine whether the computer system on which you are working is part of a local area network. If it is, determine what servers are available and how they are used. Is there a significant difference between the ways you access local resources and remote resource I do not believe I am on a local area network. I am on a private network in my house, and the only things connected to it are my devices. I could be wrong on...

1) A food server is holding a 2 kg food tray as shown. Estimate the torque...

1) A food server is holding a 2 kg food tray as shown. Estimate the torque with respect to an axis through his shoulder exerted by the force of the tray on his hand. Explain. [Note that I am not asking you for the net torque, just the torque from one force (the tray pushing on his hand).] 2)You can probably stand flatfooted on the floor and then rise up and balance on your tiptoes. Why are you unable to...

1.a) If you lift a backpack up, does the force exerted by you on the backpack...

1.a) If you lift a backpack up, does the force exerted by you on the backpack do positive, negative, or zero work? Explain your reasoning. b) If you lower lower a backpack, does the force exerted by you on the backpack do positive, negative, or zero work? Explain your reasoning. c) If you move a backpack horizontally with constant velocity, does the force exerted by you on the backpack do positive, negative, or zero work? Explain your reasoning. 2. A...

Physics 2 1. A 7.5 kg box that has an initial speed of 4.0 m /...

Physics 2 1. A 7.5 kg box that has an initial speed of 4.0 m / s slides along a rough board and reaches rest. Estimate the total change in the entropy of the universe. Assume that all objects are at room temperature (293 K) 2. What is the efficiency of a Carnot engine that is operating between a hot reserve at 800 K and a cold reserve at 400 K?

Determine the magnitude and direction of the electric field at point 1 in the figure(Figure 1).

Figure 1 Part A Determine the magnitude and direction of the electric field at point 1 in the figure(Figure 1). E1→=(2500V/m,up) E1→=(7500V/m,up) E1→=(3750V/m,down) E1→=(2500V/m,down) Part B Determine the magnitude and direction of the electric field at point 2 in the figure. E2→=(2500V/m,up) E2→=(3750V/m,down) E2→=(7500V/m,down) E2→=(5000V/m,up)

Part 1 of the assignment requires you to determine the cost of a unit of coffee...

Part 1 of the assignment requires you to determine the cost of a unit of coffee (Mona Loa and Malaysian) using the traditional overhead allocation method. A unit of coffee is a one pound bag. The unit cost will include direct materials, direct labor, and manufacturing overhead (as determined using the predetermined overhead rate). You NEED to use Excel formulas whenever possible. Basically, the only time you will not use formulas is when you enter given information. Part 2 of...

Question