Explore BrainMass


Change in Velocity of a Vertical Drop

On the center photo of page 43 measure the distance between the two images nearest the 20 cm position of the larger, heavier ball on the left. Use bottom to bottom measurements as shown in a previous figure. Repeat for the two images nearest the bottom left of the photo on page 43. Scale these distances to actual displacement

Projectile motion using trigonometry

If a pitcher threw a ball horizontally at 101.0 mph, how far would it fall vertically by the time it reached home plate, 60.5 ft away? A daredevil jumps a canyon with walls of equal height and 10 m apart. He takes off by driving a motorcycle off a short ramp sloped at an angle of 15 degrees. What minimum speed must he have in

Physics help: Newton's laws of motion

A dockworker applies a constant horizontal force of 80.0 N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves 11.0 m in 5.00 s. a) What is the mass of the block of ice? b) If the worker stops pushing at the end of 5.00 s, how far does the block move in th

Projectile Motion: Multiple collisions between two walls

Please solve each problem step by step giving solutions please. SHOW every equation used and every step getting to the answer. Show substitutions, etc. Please give units. On problem 3 show position versus time diagrams and velocity versus time diagrams please! Look below for one page. The 1st attachment has problem 1 and 2

Spring Associated with Force and Velocity


Displacement, Speed and Velocity

If a whale swims due east for a distance of 7.4 km, turns around and goes due west for 3.1 km and then turns around again and heads 3.6 km due east how do you figure out the total distance traveled by the whale?

Waves on stretched string: Wave velocity and time taken.

(See attached file for full problem description with symbols and diagrams) --- Consider a string of total length , made up of three segments of equal length. The mass per unit length of the first segment is , that of the second is , and that of the third . The third segment is tied to a wall, and the string is stretched by

Motion in Straight-Line

In a race over a distance s, runner A starts from rest and accelerates at a1 for the first distance x and then runs at constant speed. Runner B starts from rest and accelerates at a2 for the first distance x and then runs at constant speed. Runner A begins running as soon as the race begins but B first takes a nap to rest up.

Wave Frequency

Q) You dip your finger into a pan of water twice each second, producing waves with crests that are separated by 0.18m. a) Find the frequency of these water waves in Hertz. b) Find the period of these water waves in units of seconds. c) Find the speed of these water waves in m/s.

A liquid flows through two horizontal sections of tubing joined end to end. The cross sectional area, flow speed and pressure in the first tubing is given. The cross sectional area of the second tubing is given. To calculate the flow speed and pressure in the smaller section.

A liquid with a density of 1.37*10^3 kg/m^3 flows through two horizontal sections of tubing joined end to end. In the first section, the cross sectional area is 10.4cm^2, the flow speed is 276cm/sec, and the pressure is 1.42*10^5 Pa. In the second section, the cross sectional area is 2.71cm^2. a) Calculate the flow speed in

Acceleration and Displacement

How long is the electron in the accelerating region? Answer in units of s. A rocket driven sled running on a straight level track has been used to study the physiological effects of large accelerations on astronauts. One such sled can attain a speed of 408m/s in a 1.6 starting from rest. What is the acceleration of the sled,

Horizontal velocity and loft angles of golf clubs

I have a question and an answer, but It does not make sense to me, unless I have figured out the wrong answer. Please help! There are 3 golf clubs with long handles with an angled faces, 70, 60 and 48 degrees. The clubs all hit the ball with the same amount of force, which club gives the greatest horizontal velocity? A =

Simple Harmonic Motion Conceptual Question

Please help to explain the following graphs & questions in attachment. An object of mass is attached to a vertically oriented spring. The object is pulled a short distance below its equilibrium position and released from rest. Set the origin of the coordinate system at the equilibrium position of the object and choose upward

Motion in a Plane: Force and Motion

I understand how to find vertical and the horizontal components when I know my velocity and angles. But now they have thrown in a question that is with net Force and I just don't get it. Please help! The question is as follows A net force of 17.0 N is applied to a 0.34-kg soccer ball for 0.090 s, causing it to move off

Some Energy Motion Problems

Energy/Motion problems 4. A 10-kg box is pushed by from rest by a 100-Newton force at a 30 degree angle downward with respect to the horizontal. The coefficient of friction between the box and the floor is 0.35. Determine the box's velocity (in meters/second to two decimal places) after the box has been moved through a distan

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.

What is the skater's final angular velocity?

An ice skater starts spinning at the rate of 1.5rev/s with arms extended. she then pulls her arms close to her body, resulting in a decrease of her rotational inertia to three-quarters of her initial value. What is the skater's final angular velocity?

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

What is the magnitude of the momentum?

If a volleyball, which weighs .330 kg, is thrown down towards the ground with a speed of .150 m/s it takes .655 seconds to make contact. Just before it reaches the ground, what is the magnitude of the momentum?

Calculating velocity and pressure of fluids

The figure shows a nozzle on a hose carrying water. If the pressure at point 1 is 283 x 10^3 Pa, the velocity 0.68 m/s, and the diameter 10 cm, given that the diameter at point 2 is 2.5 cm what is the velocity to the nearest tenth of a m/s at point 2? What is the pressure to the nearest kPa at point 2?

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