What is the most important characteristic of muscle architecture that dictates its maximal force production?

a.) Tendon length b.) Number of sarcomeres in series c). Anatomical cross-sectional area d). Physiological cross-sectional area

You are camping in a tent, you have some very hot water (700C) in a water bladder, but you realize that in fact you do not have enough drinking water. Your plan is to melt the block of ice you have seen in front of your tent using the boiling water you have and then treat the entire quantity. You estimate that the ice block has about 1 kg and is at a temperature of about -200C. How much water do you need to melt the ice and rise its temperature to 50C?

A transformer contains four times as many turns in the secondary coil as it does in the primary coil. If the input voltage is 4000 V, what is the output voltage?

1000 V

2000 V

4000 V

8000 V

16000 V

A gymnast of mass 62.0kg hangs from a vertical rope attached to the ceiling. You can ignore the weight of the rope and assume that the rope does not stretch. Use the value 9.81m/s2 for the acceleration of gravity.

Calculate the tension T in the rope if the gymnast hangs motionless on the rope.

Calculate the tension T in the rope if the gymnast climbs the rope at a constant rate.

Calculate the tension T in the rope if the gymnast climbs up the rope with an upward acceleration of magnitude 1.20m/s2 .

Calculate the tension T in the rope if the gymnast slides down the rope with a downward acceleration of magnitude 1.20m/s2 .

*all answers in Newtons

(a) In a proton at one certain moment, the down quark has a strong color charge of red. What are the color charges of the two up quarks? (Type each color in lowercase with a space between each one.)

(d) In a pi meson at a certain time one quark has a red color. What is the color of the antiquark at that time?

Show that a satellite may speed down: that is, show that if frictional forces or reverse thrust cause a satellite to lose total energy, it will move into an orbit closer to the earth and may have increased kinetic energy.

Q1

Calculate the period of a satellite orbiting the Moon, 100 km above the Moon's surface. Ignore effects of the Earth. The radius of the Moon is 1740 km.

Express your answer using two significant figures.

a 1.0 kg ball and a 2.0 kg ball are connected by a rigid massless rod. The rod and balls are rotating clockwise about their center of gravity at 20 rpm. What torque will bring the balls to a halt in 5 seconds?

The correct answer is -0.28 N.m. I can't figure out how to get this answer. Please do not answer this question with an incorrect answer as it will be a waste of both our times.

the position vector of a mass 2.0 kg is given as a function of time, t, as

r= (3.0 m) i + (4.0 m/s)t j.

What is the angular momentum of the particle about the z axis?

• (a) 0 kg* m^2/s
• (b) 24 kg*m^2/s
• (c) -24 kg*m^2/s
• (d) 32 kg*m^2/s
• (e) -32 kg*m^2/s
• (f) 40 kg*m^2/s
• (g) -40kg*m^2/s

please explain and answer!

An object’s position is described by the equation x = At – Bt 4 + C. What are the dimensions of (a) A, (b) B, and (c) C? (d) Find the time derivative of position, dx/dt. (e) What are the dimensions of the time derivative?

A child on a sled is travelling a total distance of 93 m down a dirt hill with an angle of 30 degrees from the horizontal from the top of the hill. The mass of the child and sled is 65 kg. The initial velocity is zero and the final velocity is 5.0 m/s. (a) What is the time it takes to travel down the hill? (b) What is the acceleration down the hill? (c) What is the force of friction? (d) What is the coefficient of kinetic friction?

Two stationary positive point charges, charge 1 of magnitude 3.05nC and charge 2 of magnitude 1.75nC , are separated by a distance of 44.0cm . An electron is released from rest at the point midway between the two charges, and it moves along the line connecting the two charges.

What is the speed vfinal of the electron when it is 10.0cm from charge 1?

Express your answer in meters per second.

How will you align the compass and the large coil in earths magnetic field to get meaningful data? What measurements and calculations will you make?

Can you think of a way of performing soft lithography on curved surfaces like a glass optical fiber? Why would you want to do that?

Soft lithography is inherently a 2D printing technique, can you think of a way to taking to the third dimension? Why would this capability be useful?

A charge of 22.0 μC is held fixed at the origin.

(A)

If a -6.00 μC charge with a mass of 3.10 g is released from rest at the position (0.925 m, 1.17 m), what is its speed when it is halfway to the origin? v=__m/s

(B) Suppose the -6.00 μC charge is released from rest at the point x = 12(0.925m) and y = 12(1.17m). When it is halfway to the origin, is its speed greater than, less than, or equal to the speed found in part A? Explain

(C)Find the speed of the charge for the situation described in part B. v=__m/s