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Anonymous
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Anonymous
Asked: July 19, 2021Category: Physics

A stone is tied to a spring balance. Under which of the following conditions the reading on spring balance will show the least weight?

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  1. Mighty Ashish Guru
    Added an answer on July 19, 2021 at 5:17 pm

    The reading on spring balance will show the least weight when the stone is completely submerged in the water in a beaker.

    The reading on spring balance will show the least weight when the stone is completely submerged in the water in a beaker.

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Anonymous
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Anonymous
Asked: August 2, 2021Category: Physics

Which of the following describes an electric motor?

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  1. Mighty Ashish Guru
    Added an answer on August 2, 2021 at 7:19 pm

    Explanation: An electric motor is an electrical machine that converts electrical energy into mechanical energy.Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor'sRead more

    Explanation:

    An electric motor is an electrical machine that converts electrical energy into mechanical energy.Most electric motors operate through the interaction between the motor’s magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor’s shaft.

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Anonymous
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Anonymous
Asked: August 15, 2021Category: Physics

Rocket works on the principle of conservation of

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  1. Mighty Ashish Guru
    Added an answer on August 15, 2021 at 1:13 pm

    Explanation: Rocket works on the principle of conservation of momentum. The rockets gain momentum equal to the momentum of the gas expelled from the engine, but in the opposite direction.

    Explanation:

    Rocket works on the principle of conservation of momentum. The rockets gain momentum equal to the momentum of the gas expelled from the engine, but in the opposite direction.

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Anonymous
Anonymous
Asked: August 26, 2021Category: Physics

Magnetic striping is evidence of

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  1. Mighty Ashish Guru
    Added an answer on August 26, 2021 at 3:57 pm

    Answer: Magnetic striping is evidence of seafloor spreading.

    Answer:

    Magnetic striping is evidence of seafloor spreading.

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Anonymous
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Anonymous
Asked: September 5, 2021Category: Physics

Electric current is measured by which instrument?

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  1. Mighty Ashish Guru
    Added an answer on September 5, 2021 at 4:58 pm

    Explanation: Electric current is measured by the instrument called ammeter. As current in a circuit is measured in amperes, the instrument used is called as ammeter.

    Explanation:

    Electric current is measured by the instrument called ammeter. As current in a circuit is measured in amperes, the instrument used is called as ammeter.

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aalan
Anonymous
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Anonymous
Asked: September 14, 2021Category: Physics

Lightning heats the surrounding air to

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  1. Mighty Ashish Guru
    Added an answer on September 14, 2021 at 4:47 pm

    Explanation: Lightning is extremely hot — a flash can heat the air around it to temperatures five times hotter than the sun’s surface. This heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash. Lightning heatRead more

    Explanation:

    Lightning is extremely hot — a flash can heat the air around it to temperatures five times hotter than the sun’s surface. This heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.

    Lightning heats the surrounding air to about 30,000 degrees Centigrades.

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Anonymous
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Anonymous
Asked: September 20, 2021Category: Physics

In general, which is the cause of a sea breeze?

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  1. Mighty Ashish Guru
    Added an answer on September 20, 2021 at 12:02 am

    Explanation: The usual cause of sea breeze is the difference in specific heat capacity between land and water Land heats and cools more quickly than water. What is the cause of a sea breeze? The air over the land is warmed and rises, to a greater temperature than that over the sea. This produces a cRead more

    Explanation:

    The usual cause of sea breeze is the difference in specific heat capacity between land and water Land heats and cools more quickly than water.

    What is the cause of a sea breeze?

    The air over the land is warmed and rises, to a greater temperature than that over the sea. This produces a convection current, with cooler air flowing in from over the sea to replace that rising from the land. At night the land cools more than the sea, so the action reverses to produce a land-breeze, blowing off the land.

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Anonymous
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Anonymous
Asked: September 28, 2021Category: Physics

Negative acceleration is in the opposite direction of:

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  1. Mighty Ashish Guru
    Added an answer on September 28, 2021 at 12:20 pm

    Explanation: When an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object also has a negative acceleration.

    Explanation:

    When an object is slowing down, the acceleration is in the opposite direction as the velocity. Thus, this object has a negative acceleration. When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object also has a negative acceleration.

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Anonymous
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Anonymous
Asked: October 11, 2021Category: Physics

The speed of light will be minimum while passing through

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  1. Expert Verified
    CrazyMan Guru
    Added an answer on December 22, 2021 at 10:36 am

    The refractive index of a medium for light is given by the relation n = c/v where v is the speed of light through a vacuum. For glass, it will be 1.5 and hence, the speed of light in glass will be minimum i.e., 200 000 km/s as compared to 400 000 km/s in a vacuum. So, it will take more time for lighRead more

    The refractive index of a medium for light is given by the relation n = c/v where v is the speed of light through a vacuum. For glass, it will be 1.5 and hence, the speed of light in glass will be minimum i.e., 200 000 km/s as compared to 400 000 km/s in a vacuum. So, it will take more time for light to travel through glass.

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Anonymous
Anonymous
Asked: March 2, 2021Category: Physics

What are the advantages of friction?

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  1. Expert Verified
    CrazyMan Guru
    Added an answer on March 2, 2021 at 8:05 pm

    Friction occurs because of interactions between the surface layers of two solid materials. The exact nature of the interaction depends on the microscopic properties of each material, such as its chemical composition and crystalline structure.  [adinserter block="7"] Friction is a complex phenomenonRead more

    Friction occurs because of interactions between the surface layers of two solid materials. The exact nature of the interaction depends on the microscopic properties of each material, such as its chemical composition and crystalline structure. 

    Friction is a complex phenomenon that arises from electrostatic forces between electrons in atoms and molecules; van der Waals forces arising from changes in electron density, pressure and shear stress; changes in the normal contact forces between layers of atoms or molecules as they slip past one another; and other effects.

    The frictional force is always proportional to tangential force by the friction coefficient. A body’s static frictional properties can be changed by heating, which causes the atoms and molecules in a material to expand; therefore friction increases with temperature.

    Normal force is an object’s weight, whereas static frictional force is independent of any weight components. A sliding body or surface exerts tangential forces that may be resolved into two components: normal forces, perpendicular to the contact surface, and frictional forces parallel to it. The maximum friction is then reached when a component of the frictional force acts along that normal line; this determines a static frictional torque.

    The friction between materials depends on properties such as their composition, temperature, pressure and cleanliness (smoothness or roughness). The frictional force can be calculated by considering the materials to have μ-scale rough surfaces.

    A body with a higher coefficient of friction (μ) will accelerate more slowly in response to the same torque as another body having a lower μ value. This is because the tangential force (the component of the total force parallel to the contact surface) must be greater for low μ, and thus a lower tangential acceleration results. The graph at right helps determine when friction is dominant over inertia.

    The main advantages of friction are:

    1. Prevention of slipping
    2. Prevention of sliding down slopes (friction holds us on the road)
    3. The generation of heat allows “thermal energy” use in certain industries such as steel production and processing, chemicals, glass manufacturing etc. Heat results from friction when contact pressure is great enough to overcome thermal resistance.
    4. Friction creates an overall downward force, which prevents the crate from sliding down and hitting other objects.
    5. Friction makes the system stable. It resists any small disturbances in position of the crate so it can settle at equilibrium position without falling off.

    The main disadvantages of friction are:

    1. Friction gives rise to wear, which is undesirable in most mechanisms and machine parts. It can become extreme enough to damage components or cause failure at a certain point. For example, engines have cylinder walls that rub against the top and bottom of their cylinders (most often in the form of piston rings), and when this rubbing is enough to overcome the strength of engine material, cylinders can wear out. Friction may also be a source of noise in mechanical components.
    2. When friction results from one object sliding over another (e.g., shoes on ice), it produces heat. This is a waste of energy and hence thermodynamic loss, which would be avoided if the two surfaces could repel each other.

    Friction is also important in many biological systems, such as muscle contraction where actin-myosin interactions are used to generate mechanical force and “wear down” over time.

    Humans may experience friction as a consequence of contact between the soles of their feet and the ground, when they skate forward on a slippery or rough surface.

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