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Gravity

Newton's Law of Gravitation

Ocean tides are produced primarily by the gravitational attraction of the Moon. Explain how this attraction gives rise to two tidal "bulges" on opposite sides of the Earth, resulting in two daily high tides and two daily low tides. [hint: Consider the inverse-square relationship of the distance in the gravitational force actin

Motion Under Gravity

The height s (in feet) at the time t (in seconds) of a silver dollar dropped from the top of the Washington monument is s=-16t+555 a.) Find the average velocity on the interval [2,3] b.) FInd the instantaneous velocity when t=2 and when t=3 c.) how long will it take the dollar to hit the ground? d.) Find the velo

Exercise Physiology/Kinesiology/Physics Problem

I am trying to calculate the true weight effects of a supine leg press, standing squat, and bench press in supine. Below is communication between my previous physics professor and myself, but it really didn't answer my question. I guess I want to know if there is mathematical way to get 'true' numbers for the actual weight i

Buoyant Force of Block

A 227-kg block of cement, of density 2.8 x 10^3 kg/m^3, rests on a pedestal in front of the Al Capone Memorial Library. How much did it weigh submerged, while being hauled out of the river (freshwater)?

Specific Gravity

A metal object is hung from a scale and found to weigh 10.0 N. It is then lowered into a tank of water and its "weight," measured while its submerged, is found to be 8.00 N. What is its specific gravity?

Density of Water Over Uranium

The density of uranium is 18.7 x 10^3 kg/m^3. What is it specific gravity? How much more dense than water is uranium?

Centre of Gravity

Locate the centre of gravity of a homogeneous rod bent in the form of a semi-circular arc from A to B. The rod has a weight of 0.5 lb/ft and the radius of the arc is 2 ft.

Newton's Laws - Force

A block of mass m=2.0kg is held in equilibrium on an incline of angle=60 degrees by the horizontal force F. a) determine the value of F b) determine the normal force exerted by the incline on the block (ignore friction).

Static Equillibrium

A trucker needs to weigh a truck that is too long to fit on a platform scale. When the front wheels of the truck are run onto the scale, the scale reads W1. When the rear wheels are run onto the scale so that the front wheels are off, it reads w2. a) Prove that the total weight of the truck is W1+W2. b) Prove that if the truck i

Flow Rate Through a Water Hose

Two children, Ferdinand and Isabella, are playing with a water hose on a sunny summer day. Isabella is holding the hose in her hand 1.0 meters above the ground and is trying to spray Ferdinand, who is standing 10.0 meters away. To increase the range of the water, Isabella places her thumb on the hose hole and partially covers it

Equilibrium and Center of Gravity

A 170cm tall person lies on a light (massless) board which is supported by two scales, one under the feet and one beneath the top of the head. The two scales read, respectively, 31.6kg and 35.1 kg. Where is the center of gravity of this person?

Fluid Statics

The specific gravity of ice is .917, whereas that for seawater is 1.025. What fraction of an iceberg is above the surface of the water? *note- if possible, please explain this in the simplest way you can- i'm not naturally a science kinda gal! Thanks :)

Center of gravity

Locate center of gravity (x) of homogenous rod bent in the form of a semicircular arc. Rod has a weight per unit length of 0.5 lb/ft. radius of arc is 2ft.

Air pressure, gauge pressure

Hi. Can someone please walk me through how to do the following problem? Suppose that when you ride on your 7.70-kg bike the weight of you and the bike is supported equally by the two tires. If the gauge pressure in the tires is 70.5 lb/in^2 and the area of contact between each tire and the road is 7.13 cm^2, what is your weig

Equilibrium between gravity and electrostatic field

Two dust particles each of mass 13 ug (10^-6) are floating on a gentle stream of air. what (equal) positive charge would each dust particle have to carry in order that their electrostatic repulsion should exactly balance their gravitational attraction? What is the electrostatic potential energy of the two dust particles each

Motion in the y direction

I don't know how to approach this problem because I don't think that it will be a trajectory problem since the ball is going straight up in the air. Can you help? (See attachment.)

Gravity field of a hollow planet

A uniform, spherical planet has a spherical space at its center. The radius of the surface of the planet is Rp= 8.9E7 m (8.9 x 10^7 m). The radius of the central hollow space is Rh = 6.2E5 m. The total mass of the planet is M= 7.5E28 kg. The distance from the center to three designated points are: Point a is distance Ra= 9

Calculating the Force Gravity

Question: A steel block has a volume of 0.08 m^3 and a density of 7,840 kg/m^3, what is the force (fo) gravity acting on the block (the weight) in water? A. 5362.56N B. 6150.64N C. 6700.56N D. 7600.18N

Newton's universal law of gravity

Accodting to Newton's universal law of gravity, if the separation between to bodies is increased by a factor of three, the gravitational pull each has on the other will be X by a factor of Y ?

"From the earth to the moon", Jules Verne Physics Problem

In his novel "From the earth to the moon", Jules Verne imagined that astronauts inside a space ship would walk on the floor of the cabin when the force exerted on the ship by the earth was greater than the force exerted by the moon. When the force exerted by the moon was greater he thought the astronauts would walk on the ceili

Satellite and gravity

1. Show by algebraically reasoning that your gravitation acceleration towards an object of mass M a distance d away is a=GM/d^2 and therefore doesn't depend on your mass. 2. Can a satellite coast in a stable orbit in a plan that doesn't intersect the earth center? Defend your answer. (Include 1 or more diagrams) 3. Stude

Coplanar Forces acting on an object at different magnitudes and directions.

Three coplanar forces act on a 75000.0 kg object in outer space, where there is no gravity: 14.2 kN directed at 357°, 25.6 kN at 138°, and 16.4 kN at 255°. What is the magnitude and direction of the acceleration? If the object has an initial velocity of 17.5 miles/h directed at 58.6° in the same plane as all three

Understanding the concepts.

A) Very often a sinking ship will turn over as it becomes immersed in water. Why? B) Is it true that a floating object will only be in stable equilibrium if its centre of buoyancy lies above its centre of gravity? C) Why should one take short steps rather than long ones when walking on ice?

Pendulum's period on the earth to period on a moon: moon's gravity acceleration.

A simple pendulum, length L, completes 12 oscillations in 30 seconds here on the earth where g= 9.8 nt/kg. The same length pendulum on a certain moon of Jupiter, completes 18 oscillations in 54 seconds. a.) Find the acceleration of gravity, g1, on that moon. b.) Find the weight on the surface of that moon, of a person w

Gravity Work required to move a mass radially outward from the c.m. of a planet

See attachment #1 for diagram showing parameters. A uniform spherical planet has mass M= 8.5 E 25 kg and radius R= 7.5 E 6 m. A hole is drilled from the surface to mass m= 360 kg at an initial position r1= 2.5 E 6 m from the center. PART a. Find the initial gravity force F that the planet exerts on mass m. PART b. F