12,762 Answered Questions for the topic physics

08/03/22

Determine the minimum diamter required for the shaft of a simple torsion-bar.
A simple torsion-bar spring is shown. The shear stress in the steel [G = 11,500 ksi] shaft is not to exceed 11000 psi, and the vertical deflection of joint D is not to exceed 0.650 in. when a load... more
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08/03/22

Determine the internal bending moment and bending stress. Please help
The cross-sectional dimensions of a beam are shown. Assume bf=1.875 in., tf=tw=0.375 in. and d=4.75 in.(a) If the bending stress at point K is 2350 psi (T), determine the internal bending... more
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08/02/22

Physics problem about two rotating discs
Two parallel discs are freely rotating around the same vertical axis and in the same direction. The moment of inertia of the first disc is I1, angular velocity - ω1. The moment of inertia of the... more
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08/02/22

Body rotating about its axis problem
A rigid body composed of n particles with positions xi, and masses mi (i = 1, 2, . . . , n), rotates about the z-axis with constant angular speed ω. Show that the body’s kinetic energy is T = 0.5... more
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08/02/22

Trolley travelling along a frictionless track
A trolley travels with initial speed v0 along a frictionless, horizontal, linear track. It slows down by ejecting gas in the direction of motion. The gas is emitted at a constant mass ejection rate... more
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08/02/22

Long Exposure Pictures (Circular? vs. Streaks. Center Point? Always Same? What is the Star?)
To an expert that can help my curiosity,How is it the night sky becomes a circular streak of chalk like lines on a space/sky canvas on a long exposure pictures? Would it not consist of streaks... more
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07/30/22

World Record in Pole Vaulting: Math and Physics applied to Olympic Games
For more than two decades the world record in pole vaulting had been at 6.14 m (Sergej Bubka, 07/31/1994). Today there are a few athletes with even more impressive results. Assume the maximal... more
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Physics

07/30/22

98 Km/min to Km/hr (Please solve this question ASAP)
If a car is travelling at the speed of 98 Km/min. Then, what would be the car's speed if converted 98 Km/min to Km/h?Also, describe the formula you have done the sum and explain how to convert... more
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Physics

07/29/22

What is the frequency of motion?
A small block is attached to an ideal spring and is moving in SHM on a horizontal, frictionless surface. When the block is at xxx = 0.350 mm, the acceleration of the block is -5.84 m/s2m/s2.
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Physics

07/27/22

What would the current I1 be in (Figure 1) if the 12- Ω resistor is shorted out? Let r = 1.5 Ω

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07/26/22

Equilibrium of a System
A triangular plate, vertices at points A, B and C, has uniformly distributed mass M and is held horizontally with the help of three vertical forces acting through the three vertices. If AB = c, BC... more
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Physics

07/25/22

physics question multiple choice
an object traveling in a straight line with v=-15[m/s], and a=+2 [m/s^2] this object is:a) traveling at a constant speed towards the origin.b) moving away from the origin speeding upc) none of the... more
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Physics

07/25/22

An apartment has the dimensions 16 m by 8 m by 5 m. The temperature is 30°C, and the relative humidity is 56 percent. What is the total mass (in kg) of water vapor in the air in the apartment?
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07/25/22

Physics problem about throwing a stone into a well
The diameter of the well is d = 1.3 m, and the distance from the top of the well to the water surface is h = 5 m. What is the minimum velocity required to throw a stone from a point located a = 9 m... more
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07/25/22

Forces on a point particle
Two forces F1 = 3 N and F2 = 4 N act upon a point particle, the forces respectively form angles α = 10° andβ = 40°. Find the magnitude and angle of the resultant force with the x-axis. Consider two... more
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07/25/22

Projectile motion problem
An object is thrown with an initial velocity v0 = 21 m/s and an angle α = 60° with the horizon. At what height will its velocity make β = 30° angle with the horizon?
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07/25/22

Interesting physics problem about escalator
A physics student decided to investigate the escalator. By the time he went down the escalator for the first time, he counted n1 = 50 steps. The second time, moving down at three times the speed,... more
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07/25/22

Find the resistance between point A and B
a) A figure made of wire consists of two equilateral triangles of triangles as shown in fig. a). The length of the side of the larger triangle is a, the longitudinal resistance of the wire is ρ.... more
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Physics

07/25/22

A person stands directly in front of two speakers that are emitting the same pure tone.

The person then moves to one side until no sound is heard. At that point, the person is 4.90 m from one of the speakers and 4.93 m from the other. What is the frequency (in Hz) of the tone being... more
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Physics Math

07/25/22

kWh required to heat my swimming pool

I am building a swimming pool 9 metres by 3 metres by 2 metres deep . I want to heat it with solar panels feeding electricity to a heat pump . I need to know how many kWh of electricity I need to... more
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Physics Math

07/24/22

Find the Resultant and Equilibrant Forces of the given vectors below
A = 500 N to the EastB= 450 N to the SouthC = 400 N to the WestD= 550 N to the NorthE= 400 N 45° South of West
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Physics

07/23/22

An iceberg has a density of 0.920 g/cm^3.
Saltwater has a density of 1.025 g/cm^3. When an iceberg floats in the ocean, what percentage of the volume of the iceberg is above water, and what percentage is below water?
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Physics

07/23/22

A 64.5 g bullet is fired from a rifle having a barrel 0.935 m long.
A 64.5 g bullet is fired from a rifle having a barrel 0.935 m long. Assuming the origin is placed where the bullet begins to move, the force exerted on the bullet by the expanding gas is F = a + b... more
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Physics

07/21/22

I tried this question, and arrived at 2.2*10^3, using the formula for potential energy (question below). Is there another answer that is better?
A 15-kg load of groceries is lifted up from the ground to the fifth floor of an apartment building. Each floor is 5.00 m high. The potential energy of the groceries with respect to the second... more
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07/20/22

Mechanics problem about lifting an object
While lifting a regular uniform rectangular plate with side dimensions a and b, one of the three workers holds it at one of the four courners. At which points must the other two workers hold the... more
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