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Newton's third law and some puzzling questions

Have a couple of puzzling questions having trouble answering. 1. Since the force that acts on a bullet when a gun is fired is equaland opposite to the force that cats on the gun, does this imply a zero net force and therefore the impossibility of an accelerating bullet? Explain 2. When you jump upward the earth recoils bac


Displacement s=2t-1.8In(0.6+2t) Show expressions for velocity and acceleration of the particle.

Fluid pressure

A horizontal has a fluid flowing through it. The fluid(density = 1000kg/m^3) is flowing through it at the rate of 2 x 10^-4 m^3/s. The inside diameter of the larger portion is 3 cm and that of the diameter of the constriction is 1 cm. Find the pressure difference that exists between the larger and the constricted sections.

Calculations for Speed and Velocity

1) A 70.2 kg skater is carrying a 2.5 kg snowball and moving forward with a velocity of 9.7 m/s. The skater throws the snowball forward with a speed of 33.4 m/s. Determine the speed of the skater after hurling the snowball. 2) A 2.34 kg cannon is at rest. When ignited, it fires a 56.7 g tennis ball forward with a speed of 80.4

Two Physics Problems

1. Figure one in the attached diagram indicates the path through space of the water balloon. On the diagram, place arrows indicating the: (a) velocity vector (b) the acceleration vector for te balloon. Label which is which. Do this for the three points indicated on FIGURE 1. 7. The plot (in the figure attached) shows t

Calculating acceleration and velocity

4. A bowling ball of mass 4.0kg strikes a 10-pin of mass 0.80kg. The ball's velocity was 1.5m/s before the collision, but after the collision it is 1.2m/s. What is the velocity of the pin just after the collision? Treat this as a one-dimensional situation: we assume that the ball hits the pin "square". 5. A 60kg bicyclist is

Finding velocity after a collision of objects

A 50 g ball of putty moving with a velocity of 3.0 ms has an inelastic collision head on with a stationary mass of 50 g and sticks to it. Find the velocity of the stationary mass and the putty after the collision.

Calculating Speed

7-57 A 0.150-kg block of ice is placed against a horizontal compressed spring mounted on a horizontal tabletop that is 1.20m above the floor. The spring has force constant 1900N/m and is initially compressed 0.045m. The mass of the spring is negligible. The spring is released, and the block slides along the table, goes off the e

Simple Harmonic Motion: Three problems

(See attached file for full problem description with symbols and diagrams) 1.) A block hangs in equilibrium from a vertical spring. When a second identical block is added, the original block sags by 6.00 . Part A What is the oscillation frequency of the two-block system? 2.) The figure is the velocity-versus-time gra

Vectors and forces

(See attached file for full problem description with diagrams) --- ? A 9.26-kg sign is hung using two cables which make an angle of 34.5 degrees with the horizontal. Determine the weight (in Newtons) of the sign. ? Referring to the previous problem.) Determine the tension (in Newtons) in a single cable. ? A 55.9-kg sig

Newton's Laws of Motion Problems

See the attached file. 1. A 1-kg block of wood is dropped from a position 2.4 meters above a resting 0.05-kg ball. Shortly thereafter, the ball is shot horizontally at a velocity of 28 m/s. If the wood is 8.4 meters away from the ball in the horizontal direction, determine the distance (to two decimal places) the wood falls fro

Rotational Motion: Motion on a turn table.

A runner of mass m runs around the edge of a horizontal turntable mounted on a vertical, frictionless axis through its center. The runner's velocity relative to the earth has magnitude v. The turntable is rotating in the opposite direction with an angular velocity of magnitude omega relative to the earth. The radius of the turnt

Escape Velocity

If a planet has a mass of 9.42 x 1024 kg and a radius of 5.47 x 106 meters, to the nearest m/s what is its escape velocity? If the mass is increased by a factor of 2, what is the new escape velocity? If the radius is decreased by a factor of 0.22, what is its new escape velocity? (See attached file for full problem desc

Four problems related to rotational motion are solved.

(See attached file for full problem description with diagram and symbols) --- 1.) A thin, 80.0 disk with a diameter of 9.00 rotates about an axis through its center with 0.220 of kinetic energy. What is the speed of a point on the rim? 2.) A 3.0-m-long rigid beam with a mass of 100 kg is supported at each end. An 8

Waves, Heat and Light: Calculate velocity of electron waves

See attached file for full problem description. This course is the third in a three-term introductory physics sequence. The topics covered in this course include: I. Heat and Thermodynamics, II. Wave Phenomena, and III. Introduction to Special Relativity. These topics are essential for understanding a wide range of physical p

Head-on Elastic Collision

A ball of mass 0.192 kg has a velocity of 1.52 i m/s; a ball of mass 0.302 kg has a velocity of -0.394 i m/s.They meet in a head-on elastic collision. (a) Find their velocities after the collision. m/s i (first ball) m/s i (second ball) (b) Find the velocity of their center of mass before and after the collision. m/

Basic kinematics problems: Speed, collision, displacement, velocity, degrees

? Tom is chasing Jerry across a table 1.5 m high, Jerry steps out of the way at the last second, and tom slides off the edge of the table at a speed of 5 m/s. where will tom strike the floor and what velocity components will he have just before he hits the ground. ? Two objects are initially the same height above the groun

Basic kinematic problems: Speed, velocity, degrees, distance

Please see attached files for full problem descriptions. Problem 4: The pilot of an aircraft wishes to fly due west in a wind blowing at 55 km/h toward the south. If the speed of the aircraft in the absence of wind is 179 km/h, in what direction (in degrees) should the aircraft head? Use the counter-clockwise from east conv

Mechanics: Conservation of Momentum on Variable Mass System

Sand from a stationary hopper falls onto a moving conveyor belt at the rate of 5.00 kg/s as in the figure. The conveyor belt is supported by frictionless rollers and moves at a constant speed of 0.750 m/s under the action of a constant horizontal external force Fext supplied by the motor that drives the belt. Find (a) the san

Rotational Motion: Translation and Rotational kinetic energy

(a) Without the wheels, a bicycle frame has a mass of 8.13 kg. Each of the wheels can be roughly modeled as a uniform solid disk with a mass of 0.820 kg and a radius of 0.343 m. Find the kinetic energy of the whole bicycle when it is moving forward at 3.35 m/s. K= J (b) Before the invention of a wheel turning on an axle,

A 400 g air-track glider collides with a spring at one end of the track

I have a problem just like it in my physics book, but the mass is different. In my book it is 600 g and the answer is 0.2 s. See attached file for full problem description with diagram and units. A 400 air-track glider collides with a spring at one end of the track. The figure 1 shows the glider's velocity and the for


(See attached file for full problem description and equations) --- A stone is thrown vertically upwards so that its height, measured in feet, after t seconds is given by s(t) = 100t - 16t2. What is its initial velocity? Determine the maximum height of the stone and the time of flight of the stone. ---

Linear and angular velocity.

(See attached file for full problem description with equations) --- A bullet is shot through two cardboard disks attached a distance D apart to a shaft turning with a rotational period T, as shown. (see diagram in attachment) a) Derive a formula for the bullet speed V in terms of D, T, and a measured angle between

Motion in a straight: 6 problems

1. Calculate the average speed of the Earth in its orbit about the sun. (The radius of the orbit is 1.5 x 10^11 meters.) Give this in m/s and in miles/h. Now, what is the average velocity of the earth, averaged over one year's time? 2. Is it possible for speed to be constant while acceleration is not zero? Give an example.

Leonardo da Vinci's law of motion

Leonardo da Vinci, in the fifteenth century, formulated a different law of motion. He proposed that the distances fall in successive equal intervals of time are proportional to the consecutive integers. That is, suppose that, starting from rest, a body falls one foot in the first time interval. Then the body will traverse two fe

Ballistics cart on an incline

In a demonstration known as the ballistics cart, a ball is projected vertically upward from a cart moving with constant velocity along the horizontal direction. The ball lands in the catching cup of the cart because both the cart and ball have the same horizontal component of velocity. Now consider a ballistics cart on an inclin