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physics
college physics 2nd

Questions and Answers of College Physics 2nd

Calculate the change in length of the upper leg bone (the femur) when a 70.0 kg man supports 62.0 kg of his mass on it, assuming the bone to be equivalent to a uniform rod that is 40.0 cm long and
(a) What is the maximum frictional force in the knee joint of a person who supports 66.0 kg of her mass on that knee?(b) During strenuous exercise it is possible to exert forces to the joints that
When you push a piece of chalk across a chalkboard, it sometimes screeches because it rapidly alternates between slipping and sticking to the board. Describe this process in more detail, in
Find the mass of the picture hanging from a steel nail as shown in Figure 5.17, given that the nail bends only 1.80 μm. (Assume the shear modulus is known to two significant figures.)StrategyThe
Suppose you have a 120-kg wooden crate resting on a wood floor.(a) What maximum force can you exert horizontally on the crate without moving it?(b) If you continue to exert this force once the crate
Athletes such as swimmers and bicyclists wear body suits in competition. Formulate a list of pros and cons of such suits.
Calculate the fractional decrease in volumefor seawater at 5.00 km depth, where the force per unit area is 5.00 × 107 N/m2. Strategy ΔΙ (18) V
(a) If half of the weight of a small 1.00 x 103 kg utility truck is supported by its two drive wheels, what is the magnitude of the maximum acceleration it can achieve on dry concrete?(b) Will a
Two expressions were used for the drag force experienced by a moving object in a liquid. One depended upon the speed, while the other was proportional to the square of the speed. In which types of
Consider the 65.0-kg ice skater being pushed by two others shown in Figure 5.19.(a) Find the direction and magnitude of Ftot, the total force exerted on her by the others, given that the magnitudes
A team of eight dogs pulls a sled with waxed wood runners on wet snow (mush!). The dogs have average masses of 19.0 kg, and the loaded sled with its rider has a mass of 210 kg.(a) Calculate the
As cars travel, oil and gasoline leaks onto the road surface. If a light rain falls, what does this do to the control of the car? Does a heavy rain make any difference?where B is the bulk modulus, V0
Why can a squirrel jump from a tree branch to the ground and run away undamaged, while a human could break a bone in such a fall?
The elastic properties of the arteries are essential for blood flow. Explain the importance of this in terms of the characteristics of the flow of blood (pulsating or continuous).
Show that the acceleration of any object down an incline where friction behaves simply (that is, where fk = μk N) is a = g(sin θ- μk cos θ). Note that the acceleration is independent of mass and
What are you feeling when you feel your pulse? Measure your pulse rate for 10 s and for 1 min. Is there a factor of 6 difference?
Examine different types of shoes, including sports shoes and thongs. In terms of physics, why are the bottom surfaces designed as they are? What differences will dry and wet conditions make for these
If an object is to rest on an incline without slipping, then friction must equal the component of the weight of the object parallel to the incline. This requires greater and greater friction for
Would you expect your height to be different depending upon the time of day? Why or why not?
Calculate the maximum deceleration of a car that is heading down a 6°slope (one that makes an angle of 6° with the horizontal) under the following road conditions. You may assume that the weight of
Would you expect a large or small stress to be required to deform a spider web? Why is this elasticity an important feature for a spider web?
Explain why pregnant women often suffer from back strain late in their pregnancy.
An old carpenter’s trick to keep nails from bending when they are pounded into hard materials is to grip the center of the nail firmly with pliers. Why does this help?
A freight train consists of two 8.00 x 105-kg engines and 45 cars with average masses of 5.50 x 105 kg.(a) What force must each engine exert backward on the track to accelerate the train at a rate of
Consider the 52.0-kg mountain climber in Figure 5.20.(a) Find the tension in the rope and the force that the mountain climber must exert with her feet on the vertical rock face to remain stationary.
When a glass bottle full of vinegar warms up, both the vinegar and the glass expand, but vinegar expands significantly more with temperature than glass. The bottle will break if it was filled to its
Define normal force. What is its relationship to friction when friction behaves simply?
Critical Thinking Two boxes of equal mass slide start from rest and slide with different horizontal applied forces across frictionless surfaces to reach the same distance away. Box A has a horizontal
A physics major is cooking breakfast when he notices that the frictional force between his steel spatula and his Teflon frying pan is only 0.200 N. Knowing the coefficient of kinetic friction between
A contestant in a winter sporting event pushes a 45.0-kg block of ice across a frozen lake as shown in Figure 5.21(a).(a) Calculate the minimum force F he must exert to get the block moving.(b) What
Repeat Exercise 5.18 with the contestant pulling the block of ice with a rope over his shoulder at the same angle above the horizontal as shown in Figure 5.21(b).Data given in Exercise 5.18A
The terminal velocity of a person falling in air depends upon the weight and the area of the person facing the fluid. Find the terminal velocity (in meters per second and kilometers per hour) of an
A 60-kg and a 90-kg skydiver jump from an airplane at an altitude of 6000 m, both falling in a headfirst position. Make some assumption on their frontal areas and calculate their terminal velocities.
A 560-g squirrel with a cross-section area facing the fluid of 144 cm2 falls from a 5.0-m tree to the ground. Estimate its terminal velocity. (Use a drag coefficient for a horizontal skydiver.) What
Using Stokes’ law, verify that the units for viscosity are kilograms per meter per second.
Calculate the speed a spherical rain drop would achieve falling from 5.00 km(a) In the absence of air drag(b) With air drag. Take the size across of the drop to be 4 mm, the density to be 1.00 x 103
By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?
Critical Thinking Two spherical beads of the same mass fall at a constant speed due to a drag force. Bead A takes twice as long to fall the same distance as bead B.(a) Which of these beads has the
The pole in Figure 5.22 is at a 90.0° bend in a power line and is therefore subjected to more shear force than poles in straight parts of the line. The tension in each line is 4.00 x 104 N, at the
Find the terminal velocity of a spherical bacterium (diameter 2.00 m) falling in water. You will first need to note that the drag force is equal to the weight at terminal velocity. Take the density
During a wrestling match, a 150 kg wrestler briefly stands on one hand during a maneuver designed to perplex her adversary. By how much does the upper arm bone shorten in length? The bone can be
(a) The "lead" in pencils is a graphite composition with a Young's modulus of about 1 x 109 N/m2. Calculate the change in length of the lead in an automatic pencil if you tap it straight into the
TV broadcast antennas are the tallest artificial structures on Earth. In 1987, a 72.0-kg physicist placed himself and 400 kg of equipment at the top of one 610-m high antenna to perform gravity
(a) By how much does a 65.0-kg mountain climber stretch her 0.800-cm diameter nylon rope when they hang 35.0 m below a rock outcropping?(b) Does the answer seem to be consistent with what you have
A 20.0-m tall hollow aluminum flagpole is equivalent in stiffness to a solid cylinder 4.00 cm in diameter. A strong wind bends the pole much as a horizontal force of 900 N exerted at the top would.
Calculate the force a piano tuner applies to stretch a steel piano wire 8.00 mm, if the wire is originally 0.850 mm in diameter and 1.35 m long.
A vertebra is subjected to a shearing force of 500 N. Find the shear deformation, taking the vertebra to be a cylinder 3.00 cm high and 4.00 cm in diameter.
A disk between vertebrae in the spine is subjected to a shearing force of 600 N. Find its shear deformation, taking it to have the shear modulus of 1 x 109 N/m2. The disk is equivalent to a solid
When using a pencil eraser, you exert a vertical force of 6.00 N at a distance of 2.00 cm from the hardwood-eraser joint. The pencil is 6.00 mm in diameter and is held at an angle of 20.0 to the
To consider the effect of wires hung on poles, we take data from Example 4.8, in which tensions in wires supporting a traffic light were calculated. The left wire made an angle 30.0° below the
(a) When water freezes, its volume increases by 9.05% (that is, ΔV/V0 = 9.05 ×10-2). What force per unit area is water capable of exerting on a container when it freezes? (It is acceptable to use

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