12,727 Answered Questions for the topic physics

Physics

12/05/22

Which of the following could give rise to the Doppler Effect?
A. The source of sound is stationary and the listener must be moving.B. Either the source of sound and/or the listener is/are moving.C. The source of sound must be moving and the listener must be... more
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Physics

12/05/22

Which of the following describes the Mach number?
A. vobject B. [(vobject)/(vsound)]C. vsound D. [(vsound)/(vobject)]
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Physics

12/05/22

(a) What is the magnitude of the angular momentum of the system relative to the center of mass? (b) What is the angular speed about the center of mass?
A puck of mass m1 = 65.0 g and radius r1 = 4.20 cm glides across an air table at a speed of = 1.50 m/s as shown in Figure a. It makes a glancing collision with a second puck of radius r2 = 6.00 cm... more
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Physics

12/05/22

Basic Thermodynamics Sample Problem 3
Consider 1 kg of water that isheated at constant pressure (0.50 MPa) from a wet state (x=85%) to 400°C. Determine (a) the change of enthalpy and (b) the change of entropy.
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Physics

12/05/22

Basic Thermodynamics Sample Problem 2
A rigid vessel contains 2 kg of steam at 5.25 MPa and 300°C. Determine its enthalpy in kJ using steam tables only.
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Physics

12/05/22

Basic Thermo Sample Problem 1
Steam at a temperature of 300°C has a specific volume of 0.15436 m³/kg. What are the pressure, specific internal energy, enthalpy and entropy?
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Physics

12/05/22

I need help finding the force of friction please.

"A shopper pushes a 28N cart a distance of 53 m along a level grocery store surface. The force he exerts is 35 N at an angle of 42 below the horizontal. The coefficient of friction is .15. Find the... more
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Physics

12/05/22

Gravitational Potential Energy
Amber throws a .25 kg ball straight up with a speed of 13m/s. How do I find out how high the ball goes? How do I use the speed given to find the energy so I can find the height? Right now I only... more
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Physics

12/05/22

Elastic Potential Energy
A .15 kg ball is compressing a vertical spring by .085 meters. The spring constant is 124n/m. What height will the ball reach?
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Physics

12/03/22

I am lost and need some momentum. Please help me!
A girl on a playground swing starts from rest at an angle θ=33 from the vertical. The chains have length L=4 meters. Find her speed as she passes through the bottom of the swing. Assume no pushing,... more
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Physics

12/03/22

Someone in a car going past you at the speed of 45 m/s drops a small rock from a height of 2.1 m/s
How far from the point of the drop will the rock hit the ground? The acceleration due to gravity is 9.8 m/s. answer in m/s
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Physics

12/03/22

projectile motion
A plane is flying horizontally with speed 153 m/s at a height 5120 m above the ground, when a package is dropped from the plane. The acceleration of gravity is 9.8 m/s 2 .What is the horizontal... more
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Physics

12/03/22

Projectile Motion
Someone in a car going past you at the speed of 39 m/s drops a small rock from a height of 1.5 m. How far from the point of the drop will the rock hit the ground? The acceleration due to gravity is... more
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Physics

12/03/22

Projectile Motion
A cannon sends a projectile towards a target puttlitz (cjp3843) – Assign 8 2D and Projectile Motion – himes – (220222023) 3 a distance 1230 m away. The initial velocity makes an angle 38◦ with the... more
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Physics

12/03/22

Projectile Motion
A hiker makes four straight-line walksA 21 km at 269 ◦ B 12 km at 155 ◦C 23 km at 33 ◦D 21 km at 161 ◦in random directions and lengths starting at position (41 km, 41 km),How far from the starting... more
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Physics

12/02/22

Calculate the wavelength of the resulting wave on the cable. (Answer in meters)
A steel cable with total length 38m and mass 130kg is connected to two poles. The tension in the cable is 2,242 N, and the wind makes the cable vibrate with a frequency of 2 Hz. 
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Physics

12/02/22

What is the speed of the waves on the rope (in m/s)?
Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 2.7 m long, its mass is 0.46 kg, and the force exerted on it by the children is 43 N.
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Physics

12/02/22

What is the frequency (in Hz) of the tone being emitted? (Assume air temperature to be 20°C.)
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 5.15 m from one of... more
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Physics

12/02/22

How much energy (in kJ) is required to heat 100.0 g of water from 0.00 C to 100.0 C? ∆Hfus = 6.02 kJ/mol ∆Hvap = 44.0 kJ/mol Cwater = 4.184 J/gK
How much energy (in kJ) is required to heat 100.0 g of water from 0.00 C to 100.0 C?∆Hfus = 6.02 kJ/mol∆Hvap = 44.0 kJ/molCwater = 4.184 J/gK
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Physics

12/01/22

Terminal velocity
what is the terminal velocity of a stone of 100 grams falling from a height of 270 feet?
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Physics Math Science English

12/01/22

How to calculate the Percentage of moisture loss
Hello,i know this might be simple, but i need help so i know how to do it going forward. I did an experiment and here are my data. The sample is a dry ingredient. Weigh of tray= 6.40g weigh of... more
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Physics

12/01/22

A basketball with a mass of 0.61 kg falls vertically to the floor where it hits with a velocity of −5 m/s.

A basketball with a mass of 0.61 kg falls vertically to the floor where it hits with a velocity of −5 m/s. (We take the positive direction to be upward here.) The ball rebounds, leaving the floor... more
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Physics

12/01/22

if a 100g mass is on the 60cm mark, where would a 200g mass need to be placed to balance? Also the fulcrum is at the 50cm mark
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Physics

11/29/22

law of conservation
What is the efficiency of an out-of-condition professor who does 2.30 ✕ 105 J of useful work while metabolizing 510 kcal of food energy? (Enter your answer as a percentage.(a) How many food... more
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Physics

11/29/22

law of conservation
Find the useful power output (in W) of an elevator motor that lifts a 2600 kg load a height of 45.0 m in 12.0 s, if it also increases the speed from rest to 4.00 m/s. Note that the total mass of... more
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