Physics Fundamentals
2nd Edition
ISBN: 9780971313453
Author: Vincent P. Coletta
Publisher: PHYSICS CURRICULUM+INSTRUCT.INC.
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Chapter 4, Problem 11Q
To determine
The way one can be sure of the diet which is being followed while traveling from planet to planet- by measuring the weight on a spring scale or mass on a balance.
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A 70 kg bicyclist is riding her 15 kg bicycle downhill on a road with a slope of 80without pedaling or braking. The bicyclist has a frontal area of 0.45 m2and a dragcoefficient of 1.1 in the upright position, and a frontal area of 0.4 m2and a dragcoefficient of 0.9 in a racing position. If the downhill speed of the bicyclist(terminal velocity) can be determined when the total force acting on the “body” inthe direction of movement is equal to zero, determine the percentage of downspeed that she can be increased when she is in a racing position. Air temperatureis 150C and disregarding the rolling resistance and friction at the bearing.
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Physics Fundamentals
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- It is found that when a particular object with a mass of 0.41 kg is released from rest while immersed within a certain substance, the coefficient of proportionality regarding the resistive force is 0.621 kg/s. What is the magnitude of the resistive force that acts on this mass 1.49 s after being released? Let the resistive force be given by R = -bv (Assume that the gravitational force also acts)arrow_forwardA newborn baby’s brain grows rapidly. In fact,it has been found to increase in mass by about 1.6 mg per minute.(a) How much does the brain’s weight increase in one day? (b) Howmuch time does it take for the brain’s weight to increase by 0.15 N?arrow_forwardA small spherical bead of mass 3.00 g is released from rest at t =0 from a point under the surface of a viscous fluid. The terminal speed is observed to be vT = 2.00 cm/s.Find a) the value of the constant k that appears in F = -kv, b) the time t at which the bead reaches 0.632 vT and c) the value of the resistive force when the bead reaches terminal speed.arrow_forward
- A pulley is attached to one end of a rough plank, which makes an angle of 34◦ with the horizontal. A box is held at rest on the plank by a string that is attached to the box and passes over the pulley. A bucket of water is attached to the other end of the string and hangs freely. The coefficient of static friction between the plank and the box is 0.8. The box remains at rest but is on the point of slipping up the plank. The bucket of water has mass 7.5 kg.Name the four forces acting upon the box and draw a force diagram showing them, including the angles that show their directions.arrow_forwardThe 300-lb block shown in the figure is kept from sliding down the inclined plane by friction and a force of smallest magnitude F. If the coefficient of friction between the block and the inclined plane is 0.4, then the magnitude of the frictional force is 0.4N, where N is the magnitude of the normal force exerted on the block by the plane. If the system is in equilibrium, use Cramer's rule to solve for F and N.arrow_forwardA car engine with a given weight of w, is suspended in air by a cable that is connected to a MASSLESS ring. While the ring is supported by two cables attached to the ceiling and the wall as shown in the figure below. (a) Engine, chains, and ring 60° T3 T2 eEro n Using the cartesian coordinate system, Which of the following is the correct NET FORCE on the y-axis for the ring? Hint: The net force on the ring or the engine is zero.arrow_forward
- A railroad car which has a mass 9216 kg is constrained to move along a horizontal track under the action of a wind blowing in the direction of the track. The frictional resistance to the car motion is 1/200 of its weight. The force exerted by wind is P=kSu2, where S is the area of the backside of the railroad car, equals to 6 m2, and u is the velocity of the wind relative to car, k=0.12. The absolute velocity of the wind is w=12 m/s. The initial velocity of the railroad car is 0. Determine:a) the maximum velocity vmax of the railroad car;b) the time T taken to reach this velocity;c) the distance x, travelled by the railroad car before reaching a velocity of 3 m/sarrow_forwardTwo racquetballs, each having a mass of 170 g, are placed in a glass jar asshown. Their centers lie on a straight line that makes a 45° angle with the horizontal. (a) Assume the walls are frictionless and determine P1, P2, and P3. (b) Determine the magnitude of the force exerted by the left ball on the right ball.arrow_forwardLike friction, drag force opposes the motion of a particle in a fluid; however, drag force depends on the particle's velocity. Find the expression for the particle's velocity v(x) as a function of position at any point x in a fluid whose drag force is expressed as Fdrag = kmv where k is a constant, m is the mass of the particle and v is its velocity. Assume that the particle is constrained to move in the x-axis only with an initial velocity v0. Solution: The net force along the x-axis is: ΣF = -F = m then: -mv = m Since acceleration is the first time derivative of velocity a = dv/dt, -mv = m We can eliminate time dt by expressing, the velocity on the left side of the equation as v = dx/dt. Manipulating the variables and simplifying, we arrive at the following expression / = -k "Isolating" the infinitesimal velocity dx and integrating with respect to dx, we arrive at the following: = v0 - which shows that velocity decreases in a linear manner.arrow_forward
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