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Most of the motion generated by joints in the human body are examples of levers. An example of a third class lever is the forearm; the force which generates the motion is located in between the pivot point and the resistance force. The elbow acts as the pivot point, the biceps muscle pulls up on the forearm to move the mass which is held in the hand. Imagine you are holding an object in your hand with your forearm horizontal and your upper arm vertical so your elbow creates a 90° angle. If your biceps attach to your forearm 0.0511 m from the elbow and make an angle of 28.0° with the vertical while a 2.00 kg mass is held in your hand 29.89 cm from the elbow, what force is exerted by the biceps muscle? Ignore the mass of the forearm.
Light has a wavelength of 550 nm in a vacuum. It then enters a medium of index of refraction 1.70, What is the frequency of this light in the vacuum, What is its frequency in the medium
Suppose the pressure in a container of soda is 15 atm. At 25oC, the Henry's Law constant for CO2 in water is 1.61 x 103 atm. Estimate the mole fraction of dissolved carbon dioxide in the soda
A spring of stiffness 25 kN m-1 is compressed by an initial load of 5 kN, gradually applied, What is the total work done on the spring
A railroad car of mass 2.58 104 kg is moving with a speed of 3.88 m/s. It collides and couples with three other coupled railroad cars, What is the speed of the four cars after the collision
A very early, simple satellite consisted of an inflated spherical aluminum balloon 30 m in diameter and of mass 20 kg. What is the gravitational force on the meteor from the satellite at the closest approach
A rocket is launched at an angle of 56.0° above the horizontal with the initial speed of 101 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 28.0 m/s2. At this time, its engines fail and the rocket proceeds..
An ideal spring of negligible mass is 11 long when nothing is attached to it. When you hang a 3.20- weight from it, you measure its length to be 12.3.
Body A in the figure weighs 122 N, and body B weighs 33.5 N. The coefficients of friction between A and the incline are, What is the acceleration of A if A is initially at rest
An airplane is flying with a velocity of 90 m/s at an angle of 25 above the horizontal. When the plane is a distance 126 straight above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
A pencil (mass 5.8g and length 8.3cm) is at first balanced so that it is sitting vertically on a flat table. If the pencil then falls, find its angular velocity just before it strikes the tabletop. Assume that the mass of the pencil is distributed un..
Water has a mass per mole of 18.0 g/mol, and each water molecule (H2O) has 10 electrons. (a) How many electrons are there in 4.79 liters of water? (1 liter is equivalent to 1.00 × 10-3 m3) (b) What is the net charge of all these electrons?
Throughout liftoff, a hot-air balloon accelerates upward at a rate of 3m/s^2. The balloonist drops an object over the side of the gondola when the speed is 13m/s.
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