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Gravity

Reaction on point A

In problem 16.3(a), A 60-lb uniform thin panel is placed in a truck with end A resting on a rough hoirzontal surface and end B supported by a smooth vertical surface. Knowing that the deceleration of the truck is 12 ft/s^2, determine the reactions at ends A is a. 70.03 lb b. 60.30 lb c. 90.70 lb d. 80.71 lb

Impulse and Momentum Conceptual Situations

See attached file for full problem description. Please explain the theory behind each correct answer for the following questions 1. A rock is dropped from a high tower and falls freely under the influence of gravity. Which one of the following statements is true concerning the rock as it falls? a) It will gain an equal am

Average net force on the man during landing on the ground

A 75 kg man just before contact with the ground has a speed of 6.4 m/s. (a.) In a stiff-legged landing he comes to a halt in 2.0 ms. What is the average net force that acts on him during this time. (b.) When he bends his knees, he comes to a halt in 0.10 s. What is the average net force now? (c.) During the landing,

Motion under gravity

A 2-kg object is thrown upwards with an initial velocity of +20 m/s and travels in free-fall motion. a. Diagram the forces acting upon the ball after it leaves the hand of the thrower. As in all free-body diagrams, label every force according to type. b. Calculate the acceleration of the ball. c. Calculate the speed of the b

Speed just before impact of a falling object

A carpenter drops a hammer off the roof of a house. If the hammer falls a distance of 6.46 meters, what is the speed just before striking the ground? Neglect air friction. I believe the answer is 11.3 m/s. I need to see each step and formula to solve this question.

Waves - What is the value of g, the acceleration due to gravity, on Planet X?

Astronauts visiting Planet X have a 2.40 m-long string whose mass is 5.50 g. They tie the string to a support, stretch it horizontally over a pulley 1.60 m away, and hang a 1.80 kg mass on the free end. Then the astronauts begin to excite standing waves on the string. Their data show that standing waves exist at frequencies of 6

Circular Motion with Centripetal Acceleration

I need some help with circular motion physics questions: 1. Young David who slew Goliath experimented with slings before tackling the giant. He found that with a sling of length .598 m, he could develop a rotation rate of 8.04 rev/s in his weapon. If he increased the length to .892 m, he could revolve the sling only 5.99 time

Motion Under Gravity

1) A tennis ball is thrown vertically downward from a height of 54 feet with an initial velocity of 8 feet/second. What is its impact if it hits a six foot tall man on the head?(a(t)=-32) 2) A projectile is shot vertically upward from ground level with an initial velocity of 49 meters per second. Use a(t)=-9.8 m/sec^2 A)

Motion under Gravity

A stone is dropped from the top of a cliff. The splash it makes when striking the water below is heard 3.33 s later. How high is the cliff?

Potential Energy of Configurations

If m1 = 3.12 kg, m2 = 2.74 kg, and m3 = 2.5 kg, to the nearest hundredth of a nJ what is the potential energy of the configuration? (See attached file for full problem description)

Rotating Space Stations

Rotating Space Stations. One problem for human living in outer space is that they are apparently weightless. One way around this problem is to design a space station that spins about its center at a constant rate. This creates "artificial gravity" at the outside of the station. A) If the diameter of the space station is 8

Three objects are positioned along the x axis as follows

Three objects are positioned along the x axis as follows: 4.4 kg at x = +1.1m, 3.7 kg at x = -0.80m, and 2.9 kg at x = -1.6 m. The acceleration due to gravity is the same everywhere. What is the distance from location of the center of gravity to the location of the center of mass for this system A ceiling fan has five blades

box tend to rotate about the center of gravity

BLOCK WITH A FORCE THERE IS A BLOCK OF SIDE X METRES RESTING ON A FRICTIONLESS SURFACE A FORCE F IS APPLIED AT THE LEFT TOP OF THE BOX(TAKE THE DIRECTION OF FORCE IS FROM LEFT TO RIGHT) HORIZONTALLY NOTE: THE FORCE IS NOT AT THE CENTRE OF GRAVITY. PROVE THAT THE BOX TENDS TO ROTATE ABOUT THE CENTRE OF GRA

Velocity/basic/1/2

When scientists are trying to understand a particular set of phenomena, they often make use of, in a scientific sense, a kind of analogy or mental image of the phenomena in terms of something we are familiar with called: (a) model (b) theory (c) law (d) principle Usually a model is relatively simple and provides a stru

Find the tension on the string while the system is accelerating.

Q1) Block A of mass m1 on a smooth frictionless surface being pulled to the right by the force of gravity on block B with mass m2 by means of the attached string (as shown in the attached image). Assume no friction anywhere in the system. Assuming all units are mks, the force exerted by the gravity that is effective in moving b

Galileo dropped objects from the Tower of Pisa to study gravity

1. Galileo dropped objects from the Tower of Pisa to study gravity. The objects height above the ground could be measured using h=-4.9t^2 +56. a) How high is the Tower? 56 units b) How far has an object fallen after 2 seconds? h = -4.9^2 + 56 h = -4.9(2)^2 +56 h = -19.6 +56 h= 36.4 units c) How long will it take

Comparing Velocity of Objects Based on Mass; Pendulum

Can anyone please show me how to get started on the attached lab questions? Thanks! Part 2 (also attached) Equipment: A length of string, a compact object which can be tied to the string like a metal washer, a tack, a stopwatch or clock, and a meter or yard stick. Procedure: I. Tie your object to the string and ti

Mass, Acceleration and Gravity

A plane is 45 degrees to the horizontal with a stationary mass on it. The mass is 12 kg and the acceleration of gravity is 9.8 m/s^2. What is the magnitude of the force of friction required to keep the mass from moving? Answer with the number of Newtons using digits.