4,347 Answered Questions for the topic Science

Science Physics

12/03/20

Two resistors are submitted to a 12 V potential. When linked together, the current is of 1.33 A. When in parallel, the current is of 5.4 A. What are the values of their resistances?
A) 4 OHM and 5 OHMB) 4 OHM and 2 OHMC) 7 OHM and 2 OHMD) 5 OHM and 1 OHME) 4.5 OHM and 4.5 OHM
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Science Physics

12/03/20

An Ohmic Resistor of electrical resistance of 1500 OHM is passed through an electrical current of 1 mA. Determine the potential difference applied to the terminals of this Resistor!
a) 1.5 Vb) 2.5 Vc) 5 Vd) 7.5 Ve) 0.25 V
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Science Physics

12/03/20

Ohmic Resistors are those who?
a) Are made of insulating materialsb) Have constant electrical resistancec) Present great electrical resistanced) Are able to withstand great electrical currentse) Are usually made of conductor... more
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Science Physics

12/03/20

An Ohmic Resistor is crossed by a 0.5 A current, while plugged in to a 12 V battery. The electrical resistance of this Resistor equals?
a) 24 OHMb) 4 OHMc) 8 OHMd) 12 OHMe) 6 OHM
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Science Physics

12/03/20

Which of the following statements are true and which are false?
1 - The resistance of the equivalent resistor is smaller than the smallest of resistances of these resistors.2 - A electrical current is smaller in the biggest resistance' resistor3 - The... more
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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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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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Science Chemistry

12/02/20

Calculate the amount in moles
Calculate the amount in moles: 2.01 x 10^23 atoms of Rubidium a. 1.2 molb. None of the abovec. 3.11 mold. 0.5 mole. 1 mol
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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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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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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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12/02/20

How do scientists perform intercellular colonization of non-leguminous plants by rhizobia? How do they make the bacteria enter the said plants?
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Science Physics

12/01/20

physics question - answer is 233 N but idk how to do this
A more aggressive snowboarder decides that rain is perfectly OK. She goes up to Snoqualmie Pass to board down the slopes in the rain. The angle of the slope is 36.0°. She is sliding down the... more
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Science Physics

12/01/20

physics question
A block of mass 10 kg slides down an inclined plane elevated 30◦ to the horizontal. If the coefficient of kinetic friction is 0.6, find the acceleration of the block.
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Science Biology

11/30/20

Question about osmosis

How does placing carrots in water keep them crisp and fresh? Explain using the words solute, water, hypertonic, hypotonic, and isotonic.
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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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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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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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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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Science Botany Plant Plants

11/30/20

bryophytes ( mosses, liverworts, ferns)
Fill in the following  to compare mosses, liverworts and fernsCapsule formcolumelladehiscencedispersion of sporesgrowthmaturation of sporespersistencesetastomataplease put your references thank you... more
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Science Math Physics

11/30/20

A student is pulling a 15 kg cart up a ramp with a rope that is parallel to the surface of the ramp.

A student is pulling a 15 kg cart up a ramp with a rope that is parallel to the surface of the ramp. If the ramp is angled at 25 degrees, calculate the following:Draw the FBD for this... more
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Science Biology

11/28/20

meiosis what types of cells?
A. Identical sperm and egg cells B. Unidentical sperm and egg cells c. Identical body cells d. Unidentical body cells
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Science Physics

11/28/20

Physics question
A car has a mass of 1020 kg and has a coefficient of static friction between the ground and its tires of 0.85. What force of friction can it exert on the ground? What is the maximum acceleration... more
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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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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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