1,302 Answered Questions for the topic physical science

Physical Science

12/06/20

Find the Force of friction

The person and the sled have a weight of1500 N. The dogs must exert a combinedhorizontal force of 300 N to pull the sledat constant velocity. Find the normalforce and the force of friction on the... more
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Physical Science

12/06/20

Weight and Mass & Forces in Equilibrium
A pendant hangs from chains that make a 90 degree angle to each other as shown inthe diagram. If the tension on the left side is 4N and the tension on the right side is3N, find the weight of the... more
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Physical Science Math Science Physics

12/05/20

Find the air temperature (in K).
In a student laboratory exercise, the wavelength of a 52,300 Hz ultrasound wave is measured to be 0.660 cm. Find the air temperature (in K).
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Physical Science Math Science Biology

12/04/20

How often must an adult Peregrine kill to support its young?
How often must an adult Peregrine kill to support its young?
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Physical Science Science Physics

12/03/20

Approximately how many times louder is a 145-dB sound than a 85-dB sound?
Approximately how many times louder is a 145-dB sound than a 85-dB sound?
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Physical Science Science Physics

12/03/20

How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan hears the sound?
A baseball fan sitting in the "cheap seats" is d = 122 m from home plate (see the figure below). How much time elapses between the instant the fan sees a batter hit the ball and the moment the fan... more
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Physical Science Science Physics

12/03/20

How far (in m) is the surface of the snow from the device?
A sonic depth gauge is placed 4.2 m above the ground. An ultrasound pulse sent downward reflects off snow and reaches the device 0.023 seconds after it was emitted. The air temperature is −20°C.(a)... more
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Physical Science Science Physics

12/03/20

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 7.15 m from one of... more
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Physical Science Science Physics

12/03/20

What is the air temperature (in K)?
In a student laboratory exercise, the wavelength of a 52,300 Hz ultrasound wave is measured to be 0.660 cm. Find the air temperature (in K).
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Physical Science Science Physics

12/03/20

Calculate the wavelength of the resulting wave on the cable.
A steel cable with total length 68 m and mass 150 kg is connected to two poles. The tension in the cable is 2,039 N, and the wind makes the cable vibrate with a frequency of 2 Hz. Calculate the... more
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Physical Science Math Science Physics

12/03/20

what is the speed of waves on the Slinky (in m/s)?
A 5.2 Hz continuous wave travels on a Slinky. If the wavelength is 0.61 m, what is the speed of waves on the Slinky (in m/s)?
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Physical Science

12/03/20

A piece of Zinc with a mass of 0.027 kg us heated from 22C to 100C. What was the amount of heat added?
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Physical Science

12/03/20

How much energy is required to raise the temperature of 3 kg of Copper from 0C to 10C?
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12/03/20

Clamping Force and Clutch Calculation
A multiple clutch has to transmit 90kW from an engine running at 3500 rpm.Clutch lining outer diameter is 200mm and inside diameter is 160mm. Spring pressure on clutch is 170kPa and it's... more
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Physical Science Math Science Physics

12/02/20

What is the linear mass density of the rope (in kg/m)?
Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 4.1 m long, its mass is 0.60 kg, and the force exerted on it by the children is 55 N.(a)What is... more
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Physical Science Science Physics

12/02/20

what factor will the amplitude of the sound change?
An audio speaker producing a steady sound at an outdoor concert is 32 ft away from you. If you move to a position where the speaker is 64 ft distant, by what factor will the amplitude of the sound... more
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Physical Science Science Physics Physics B

12/02/20

meter stick urgent help
A uniform meter stick of mass 1.5kg is attached to the wall by a frictionless hinge at one end. On the opposite end it is supported by a vertical massless string such that the stick makes an angle... more
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Physical Science Science Physics Physics B

12/02/20

Pencil urgent help
A pencil leans against a wall so that its sharpened edge rests against the vertical surface of the wall and its eraser rests on the floor. The center of mass of the pencil is 9 cm from the end of... more
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Physical Science Science Physics Physics B

12/02/20

piece of putty urgent help
A piece of putty of mass m = 0.75 kg moves at a velocity of v = 2.5 m/s along a horizontal frictionless surface. It hits and sticks to the bottom of a rod of mass M = 2 kg and length L = 0.9 m... more
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Physical Science Math Science Physics

11/30/20

What is the total mass (in kg) of water vapor in the air in the apartment?
An apartment has the dimensions 15 m by 8 m by 5 m. The temperature is 25°C, and the relative humidity is 57 percent. What is the total mass (in kg) of water vapor in the air in the apartment?
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Physical Science Math Science Physics

11/30/20

 At what temperature would the wing be 2 cm (0.02 m) shorter?
An aluminum wing on a passenger jet is 28 m long when its temperature is 15°C. At what temperature would the wing be 2 cm (0.02 m) shorter?
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Physical Science Science Physics

11/30/20

How much longer is it when it contains boiling water at 1 atm pressure?
An aluminum vat is 12 m long at room temperature (20°C). How much longer is it when it contains boiling water at 1 atm pressure?
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Physical Science Math Science Physics

11/30/20

how much energy (in J) was made unavailable for useful work as a result?
An irreversible process takes place by which the entropy of the universe increases by 1.66 J/K. If the temperature of the environment in which the process occurred is 230 K, how much energy (in J)... more
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Physical Science Science Physics

11/28/20

At what temperature would the wing be 2 cm (0.02 m) shorter?
An aluminum wing on a passenger jet is 28 mlong when its temperature is 15°CAt what temperature would the wing be 2 cm (0.02 m) shorter?
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Physical Science Math Science Physics

11/28/20

What is the total mass (in kg) of water vapor in the air in the apartment?
An apartment has the dimensions 15 m by 8 m by 5 m. The temperature is 25°C, and the relative humidity is 57 percent. What is the total mass (in kg) of water vapor in the air in the apartment?
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