Category: Physics

When two vectors A and B are added then maximum value of resultant is? Answer. R is maximum when Cos ( A, B) = +1 ie angle between vectors A and B is zero ie vectors A and B are parallel to each other. The resultant of two vector is minimum when both vectors are […]

Will China share moon samples? China has recovered the lunar samples collected by the daring Chang’e 5 mission and now work is underway to get the materials to the laboratory for science — and for sharing. The Chang’e 5 reentry capsule landed in Inner Mongolia on Dec. 16, marking the end of the 23-day mission. […]

Why do oppositely charged particles have to attract repel each other? The two charges repel each other. If a positive charge and a negative charge interact, their forces act in the same direction, from the positive to the negative charge. As a result opposite charges attract each other: The electric field and resulting forces produced […]

Is sleet or ice worse? 1. Freezing rain and sleet are a winter storm’s silent hazards. Ice in the form of freezing rain and sleet is just as big of a threat as snow, and often result in a winter weather advisory being issued for the affected region. Ice is arguably more dangerous than the […]

What is the angle of rotation of a circle? In mathematics, the angle of rotation is a measurement of the amount, of namely angle, that a figure is rotated about a fixed point, often the center of a circle. If a cart moves around the wheel once, the angle of rotation is 360°. What is […]

What is a example of hardness? Hardness is a measure of how much a material resists changes in shape. Hard things resist pressure. Some examples of hard materials are diamond, boron carbide, quartz, tempered steel, ice, granite, concrete. Ability of material to resist wear, tear, scratching, abrasion cutting is called hardness. What is the difference […]

How many kW is a lift motor? Let’s say the machine lifts it up at a rate of 1 meter per second. So power needed would be 1000 x 1 = 1kW. But this is the power needed without frictional and other losses. Fairly assuming that the motor and pulley assembly is 80% efficient, actual […]

How do you increase the force of a wire? If the current-carrying wire is placed in a magnetic field (whose lines of force are at right angles to the wire) then it will experience a force at right angles to both the current direction and the magnetic field lines. The force increases if the strength […]

What would happen if it rained forever? Floods would turn into mudslides which would turn into full landslides. This would compounded by the assumption that due to rain, little direct sunlight would come through, which would mean vegetation would start to die off. Many plants would die from being completely waterlogged. Is the whole world […]

Who uses 60Hz? Only a handful use 60Hz. The standard in the United States is 120V and 60Hz AC electricity….Listing per country. Country Voltage Frequency Austria 230V 50Hz Azerbaijan 220V 50Hz Azores 230V 50Hz Bahamas 120V 60Hz Why does Japan use 100v? The reason Japan became 100 volts was at the time Japan imported generators […]