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velocity and acceleration..

4.) A car has an average speed of 80.0 km/h for one hour, then an average speed of 90.0 km/h for two hours during a three-hour trip What was the average speed for the three-hour trip? 5.) What is the acceleration of a car that moves from a speed of 5.0 m/s to a speed of 15m/s during a time of 6.0 s? 10.) An archer shoots a

Displacement vs Time and Velocity vs Time

Hi, I need assistance on this one problem. I need all work shown to understand. The distance between windowsills I am confused about. See attachment for diagram: Please apply the techniques used in Lab 3 (particularly the ticker tape) to the following photo: Distance between windowsills is 3.15 meters. Three photographs

Magnetic Force and Magnetic Fields

A uniform magnetic field of magnitude B=1.2 teslas is directed toward the bottom of the page in the -y direction. At time t=0, a proton p in the field is moving in the plane of the page with a speed v=4 x 10^7 meters per second in a direction 30 degrees above the +x axis. a.) Calculate the magnetic force on the proton at t=0

Guitar String: Speed and Frequency

One of the 63.5-cm-long strings of an ordinary guitar is tuned to produce the note B_3 (frequency 245 Hz when vibrating in its fundamental mode. a). Find the speed of transverse waves on this string. b). If the tension in this string is increased by 1.0%, what will be the new fundamental frequency of the string? Express y

Wave Propagation in a String of Varying Density

Consider a string of total length L, made up of three segments of equal length. The mass per unit length of the first segment is mu, that of the second is 2mu, and that of the third mu/4. The third segment is tied to a wall, and the string is stretched by a force of magnitude Ts applied to the first segment; Ts is much greater t

Wave Notation

A). Find an expression for the period of a wave, T, in terms of other kinematic variables. Express your answer in terms of any of f, v, omega, and simple constants such as pi.

Torricelli's Theorem

Water stands at a depth H in a large open tank whose side walls are vertical (see attachment for figure). A hole is made in one of the walls at a depth h below the water surface. a) At what distance R from the foot of the wall does the emerging stream strike the floor? Express your answer in terms of the given quantities.

momentum and impulse

Please see attachment. Thank You your help is greatly needed. 1. A stunt person jumps from the roof of a tall building, but no injury occurs because the person lands on a large, air-filled bag. Which one of the following best describes why no injury occurs? 2. Jennifer is walking at 1.63 m/s. If Jennifer weighs 583 N, what

Velocity and Acceleration

1. The distance-time relationship for a moving object is given by s(t) = kt2 + (6k^2 - 10k)t + 2k, where k is a non-zero constant a) show that acceleration is constant b) Find the time at which the velocity is zero, and determine the position of the object when this occurs. 2. An object moves so that its velocity, v,

speed of waves on the string

Please see the attached file. The speed of waves on a certain string is 2 m/s. Another string has a mass per unit length that is 4 times as great as the first string and a tension that is 2 times as great. What is the speed of waves on the second string.

Instantaneous Center of Zero Velocity

See the attached file. The elements of a switching device are shown. If the vertical control rod has a downward velocity of V = 3 ft/sec when phi = 60 degrees, and if roller A is in continuous contact with the horizontal surface determine the magnitude of velocity of C for this instant using the method of "instantaneous cen

Birefringent materials

What is meant by the optic axis of a uniaxial birefringent crystal? Could you please describe and explain how birefringent materials may be used to produce linearly and circularly polarized light from unpolarized light? Thank you.

Projectile motion

Please see the attached file. 1. A rocket is launched at an angle of 53.0° above the horizontal with an initial speed of 100 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 30.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. Find (a) the max

Flywheel Kinematics

A heavy flywheel is accelerated (rotationally) by a motor that provides constant torque and therefore a constant angular acceleration alpha. The flywheel is assumed to be stationary at time t = 0 in Parts A, B, and C of this problem. a). Find the time t_10 it takes to accelerate the flywheel to 10.0 rps (revolutions per secon

Spring and Projectile of a thrown ball

A child's toy consists of a block that attaches to a table with a suction cup, a spring connected to that block, a ball, and a launching ramp. The spring has a spring constant, k, the ball has a mass, m , and the ramp rises a height, y, above the surface of the table, the surface of which is a height, H, above the ground. Initia

Velocity & Displacement of a Block

A spring of constant k=200N/m is attached between a block of mass 2 kg and a vertical wall.The block rests on a frictionless plane and the COG of the block and the spring are in the same line horizontal to the table. If a constant force of 10N (in the positive x direction) is applied to the spring at t=o when the spring in un

Angular Displacement and Motion d

1. The angular displacement of a human centrifuge, of length 30 ft, is given by (theta)= 4[t + 30*e^(-.03t)-30]radians where t is in seconds and and t=0 is start up. If the passenger loses consciousness at an acceleration of 10g's determine the time this would occur. Verify the tangential acceleration is small compared to


Hello I need help with the following Physics problems. 9. A train approaches a small town with a constant velocity of +28.6 m/s. The operator applies the brake, reducing the train's velocity to +11.4 m/s. If the average acceleration of the train during brake is -1.35 m/s^2. For what elapsed time does the operator apply the br

Determining Magnitude of Velocity and Acceleration

See the attached file for diagram. The fixed horizontal guide carries a pin P whose motion is controlled by the rotating slotted arm OA. If the arm is revolving about O at the constant rate of 2 radians/sec (angular velocity)for the for the interval allowed by the horizontal guide determine the magnitudes of the velocity an

Solid mechanics

See attached 1. A 2-lb ball is thrown upward at 30ft/s from an origin 5-ft above the earth's surface. Using for your positive reference a vertical Y axis with its origin at 5ft, DETERMINE FOR THE BALL: a) The maximum height in ft reached b) The elapsed time of flight in seconds until its return to the origin c) Its a

A raindrop is observed at time t=0 when it has mass m and downward velocity u. As it falls under gravity its mass increases by condensation at a constant rate and a resisting force acts on it, proportional to is speed and equal to v when the speed is v. a) Show that d/dt((M^2)v) = (M^2)g where M = m+ t. b) Show that the speed of the raindrop at time t is (g/3 )[m+ t-((m^3)/(m+ t)^2)] + ((m^2)u)/(m+ t)^2

Please see the attached file for full problem description. Provide solution for Q7 only. Q7. A raindrop is observed at time t=0 when it has mass m and downward velocity u. As it falls under gravity its mass increases by condensation at a constant rate and a resisting force acts on it, proportional to is speed and equal

Particle Mass and Speed

Please see attached file for full problem description. A particle whose initial mass is m is projected vertically upwards at time t=0 with speed gT, where T is a constant. At time t its speed is u and its mass has increased to me^(t/T). a) If the added mass is at rest when it is acquired, show that d/dt(mue^(t/T)) = -mge^(t