Chapter 4, Problem 2Q

A dog and a sledge are on the frictionless ice of a frozen lake, 11.6 m apart but connected by a rope of negligible mass. The dog exerts a certain horizontal force (N) on the rope. If magnitudes of the sledge and the dog accelerations are o.8 m/s and o.2 m/s2, respectively. How far from the dog's initial position (m) do they meet?

The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons). (a) What is the force between the two alpha particles when they are 6.84 ✕ 10−15 m apart? N(b) What is the initial magnitude of the acceleration of the alpha particles due to this force? Note that the mass of an alpha particle is 4.0026 u. m/s2

The nucleus of 8Be, which consists of 4 protons and 4 neutrons, is very unstable and spontaneously breaks into two alpha particles (helium nuclei, each consisting of 2 protons and 2 neutrons). (a) What is the force between the two alpha particles when they are 5.16 ✕ 10−15 m apart? (b) What is the initial magnitude of the acceleration of the alpha particles due to this force? Note that the mass of an alpha particle is 4.0026 u.

An engine exerts a force of 8000 N on a 1000 kg car travelling over a flat road (with coefficient of friction μk). The force accelerates the car from 25 m/s to 40 m/s in 5 s. Find, (a) the net acceleration of the car, and (b) μk between the car and the road?

As a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by a tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 48.5 kg. if this fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 5.80 m/s after two-thirds of its length has left the surface.  what is the magnitude of the force F during the interval

A particle of mass 4.00 kg, moving on a horizontal table top, has an acceleration vector (in m/s2) given by a =9.10ı^ + 1.80ȷ^, where ı^ and ȷ^ are the unit vectors along the x and y axes, respectively. This particle is subjected to two horizontal forces, expressed in newtons by F⃗ 1=2.00ı^ + 3.00ȷ^ and F2. Calculate the force F2 in newtons. Give your answer to one decimal place

A 1200-kg trailer is hitched to a 1400-kg car. The car and trailer are traveling at 72 km/h when the driver applies the brakes on both the car and the trailer. Knowing that the braking forces exerted on the car and the trailer are 5000 N and 4000 N, respectively, determine (a) the distance traveled by the car and trailer before they come to a stop, (b) the horizontal component of the force exerted by the trailer hitch on the car.

As a fish jumps vertically out of the water, assume that only two significant forces act on it: an upward force F exerted by the tail fin and the downward force due to gravity. A record Chinook salmon has a length of 1.50 m and a mass of 54.5 kg. If this fish is moving upward at 3.00 m/s as its head first breaks the surface and has an upward speed of 6.30 m/s after two-thirds of its length has left the surface, assume constant acceleration and determine the following. (a) the salmon's acceleration m/s2 upward (b) the magnitude of the force F during this interval

An electron (mass = 9.11 X 10-31 kg) leaves one end of a TV picture tube with zero initial speed and travels in a straight line to the accelerating grid, which is 2.70cm away. It reaches the grid with a speed of 3.30 X 106 m/s. If the accelerating force is constant, compute (a) %3D the acceleration (b) the time to reach the grid (c) The net force, in Newtons. Ignore the gravitational force on the electron.