Concept explainers
The sum of the forces acting on the car and the sum of the forces acting on th descending mass.
Answer to Problem 1EP
The sum of the forces for the car is
Explanation of Solution
Draw a diagram to show the components of forces for a car moving in an inclided plane.
Write the expression for the sum of the force acting on the car.
Here,
Write the expression for parallel force acting on the car.
Here,
Write the expression for the sum of forces acting on the descending mass.
Here,
Conclusion:
Substitute
Thus, the sum of the forces for the car is
Want to see more full solutions like this?
Chapter 12 Solutions
Physics Laboratory Experiments
- Show that the acceleration of any object down an incline where friction behaves simply (that Is, where fk=kN ) is a=(sinkcos) . Note that the acceleration Is independent of mass and reduces to the expression found in the previous problem when friction becomes negligibly small (k=0) .arrow_forwardConsider a thin slice of the first rod, of thickness dr, that is located a distance r from the origin and a thin slice of the second rod, of thicknessdo2, that is located a distance t2 from the origin. Enter an expression for the magnitude of the force dF12 that the thin slice of rod 1 exerts on the thin slice of rod 2, interms of L1, L2, Q1, Q2, *1, *2, and the Coulomb constant k.Write an equation for the total force on the slice dr of the second rod, due to the total charge on the first rod, in terms of the defined quantitiesCalculate the magnitude of the total force, in newtons, on the second rod due to the total charge on the first rod.arrow_forwardQ 1: Find the outcome of the convergent forces system in the form belowarrow_forward
- The initially stationary 27-kg block is subjected to the time-varying horizontal force whose magnitude P is shown in the plot. Note that the force is zero for all times greater than 10 s. Determine the time ts at which the block comes to rest.arrow_forwardWhat average force is required to stop a 1400 kg car in 8.0 s if the car is traveling at 85 km/h? Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite of the initial velocity.arrow_forwardA particle of mass M is allowed to fall from rest at a distance b from the origin at which a constant force acts that attracts the body according to the inverse square law f (x) _kx² Calculate the time required for the object to reach the origin pointarrow_forward
- •• The two masses in the Atwood’s machine are initially at rest at the same height. After they are released, thelarge mass, m2, falls through a height h and hits the floor, andthe small mass, m1, rises through a height h. (a) Find the speedof the masses just before m2 lands, giving your answer in terms ofm1, m2, g, and h. Assume the ropes and pulley have negligible massand that friction can be ignored. (b) Evaluate your answer to part(a) for the case h = 1.2 m, m1 = 3.7 kg, and m2 = 4.1 kgarrow_forwardA block of mass M slides down a frictionless plane inclined at an angle ? with the horizontal. The normal reaction force exerted by the plane on the block is? CHOICES: MgMg sin Mg cos "zero, since the plane is frictionless.?arrow_forwarda person in kayak atarts padding, and it accelarates from 0 to 0.474 m/s in a distance of 0.584 m. if the combined mass of the person and the kayak is 69.9kg, what is the magnitude of the net force acting on the kayak?arrow_forward
- Block X of mass M is attached to block Y of mass 2M by a light string that passes over a pulley of negligible friction and mass, as shown above. In which direction will the center of mass (COM) of the two-block system move after it is released from rest, and what is the magnitude of the acceleration a of block X ?arrow_forwardA dated box of dates, of mass 5.00 kg, is sent sliding up a frictionless ramp at an angle of to the horizontal as a function of time t, the component vx of the box’s velocity along an x axis that extends directly up the ramp.What is the magnitude of the normal force on the box from the ramp?arrow_forwardA team of dogs pulls a sled of mass 2m with a force . A second sled of mass m is attached by a rope and pulled behind the first sled. The tension in the rope is . Assuming frictional forces are too small to consider, determine the ratio of the magnitudes of the forces and , that is, P/T.arrow_forward
- Classical Dynamics of Particles and SystemsPhysicsISBN:9780534408961Author:Stephen T. Thornton, Jerry B. MarionPublisher:Cengage LearningUniversity Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice UniversityPhysics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage Learning
- Principles of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning