09/06/23

If the Sun's mass is about average, how many stars are there in the Milky Way galaxy? The mass of the Sun is of the order of 10^30 kg and the mass of the Milky Way galaxy is of the order of 10^42 kg.
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08/21/22

Physics 101 question
At time t = 0 an object is traveling to the right along the ±x axis at a speed of 10.0 m􏰀s with acceleration –2.0 m􏰀s2. Which statement is true?(a) The object will slow down, eventually coming to... more
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09/24/21

Physics Free Fall
An arrow is fired into the air and it reaches its highest point 3.0 seconds later. What was its velocity when it was fired?
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02/18/21

Find the attractive Coulombic force
 A proton is located at x =1.0nm, y=0.0nm and an electron is located at x=0.0nm, y=4.0nm. Find the attractive Coulombic force between them. (k= 9x10^9Nm^2/C^2)
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02/17/21

A top is spinning at 34.8 rad/s, and has an angular momentum of 0.470 kg•m?/s. What is its moment of inertia?
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02/17/21

Physics, Motion, show solving steps please
The roof of a two-story house makes an angle of 29° with the horizontal. A ball rolling down the roof rolls off the edge at a speed of 5.1 m/s. The distance to the ground from that point... more
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12/14/20

Calculate the force of gravity between a newborn baby and the obstetrician, who is 0.5 m from the baby. Which exerts more gravitational force on the baby, Mars or the obstetrician? By how much?
newborn baby- a mass of 3 kgobstetrician- a mass of 100 kg
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12/11/20

How fast is the car moving at the bottom of the hill?
A 1200-kg car, initially at rest, rolls 80 m down a hill inclined at a 6.0⁰ angle. A 400-N force of friction opposes it motion. How fast is the car moving at the bottom of the hill?
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11/16/20

lesson 15-1 practice

A submarine cruising level is at 175 meters below the sea's surface. If the submarine starts to dive down to deeper water at a rate of 12.5 meters per minute, which equation could be used to... more
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11/14/20

What formula would I use?
The United States generates some 240 million tonnes of solid waste each year, with an energy content (when dry) essentially the same as that of wood, about 20 MJ/kg. Find the equivalent in barrels... more
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11/14/20

How high (in m) will the swing be at the high point?
A child on a swing has a speed of 3.7 m/s at the low point of the arc.How high (in m) will the swing be at the high point?
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11/07/20

In an electron microscope, there is an electron gun that contains two charged metallic plates 2.60 cm apart.
 An electric force accelerates each electron in the beam from rest to 9.10% of the speed of light over this distance. (Ignore the effects of relativity in your calculations.)(a) Determine the... more
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11/06/20

If a box is held 3m above the ground and it has a Fg= 400N how much work is being done to hold the box in place? How do you know?
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11/05/20

I need help with this physics question please I cannot solve it. Please explain your work if you don't mind.
A F-35 jet fighter moving horizontally at 200 m/s drops a missile, the missile immediately fires its engine, accelerating at 20 m/s^2 in the x-direction while it makes a free fall in the... more
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11/03/20

A 55.2 kg softball player moving 3.11 m/s slides across dirt with Hk =0.310. How far does she slide before coming to a stop?
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11/02/20

A 57 kg basketball player jumps vertically upward to make a shot. At the very top of her jump, she throws the basketball with a speed of 4.4 m/s.
What is her recoil velocity immediately after she releases the ball? The mass of the basketball is 0.62 kg. At the very top of the jump, what is the change in KE of the basketball? What force would... more
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11/02/20

A 10 metric ton train moves toward the south at 40 m/s. At what speed must it travel to have four times its original momentum?

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11/01/20

How can I solve this?
At one particular moment, a 19.0 kg toboggan is moving over a horizontal surface of snow at 4.10 m/s. After 9.00 s have elapsed, the toboggan stops. Use a momentum approach to find the magnitude of... more
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10/30/20

The spherical rock is sitting on the edge of the cliff and has a mass of 315 kilograms. Jennie has a mass of 65 kilograms. The cliff is 216 meters tall.
The spherical rock is sitting on the edge of the cliff and has a mass of 315 kilograms. Jennie has a mass of 65 kilograms. The cliff is 216 meters tall.What is the gravitational potential energy of... more
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10/29/20

Block and ramp help
A block starts with a speed of 15 m/s at the bottom of a ramp that is inclined at an angle of 30 ̊ above the horizontal. The coefficient of kinetic friction between the block and the plan is 0.2.... more
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10/29/20

The measure of an angle is nine more than twice its complement. Find the measure of each angle
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10/29/20

The rock has a mass of 0.6 kilograms and the string is 1.14 meters long. It is spinning at 1.2 radians per second.
The rock has a mass of 0.6 kilograms and the string is 1.14 meters long. It is spinning at 1.2 radians per second.What is the force Jim must apply on the string to keep the rock spinning at that... more
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10/28/20

Free Body Diagram

A block with a mass of m rests on a rough surface and is subject to two forces acting on it. The first force is directed in the negative x-direction. The second acts on the body at an... more
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10/28/20

An object with a weight of 600 Newtons rests on the floor. What force is the floor exerting on the object?
A. 0 newton B. 300 newtons downward C. 600 newtons down D. 600 newtons upwards
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10/28/20

Trigonometry word problem
At 6 a.m., the angle of elevation of the sun from the horizon is 0 degrees. At noon, the angle of elevation of the sun is 87 degrees. At some time before noon, a flagpole 50 feet tall casts a... more
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