Tag: science & technology

If an object is placed in water and sinks, it is because it has no buoyancy force acting on it.

We often tend to fall backwards when a bus, carrying us, just starts moving. It happens because of:

When a person uses a simple machine, such as a lever or a pulley, the work or energy output from the simple machine becomes (neglect any potential energy that may have been previously stored in the machine) :

Under typical conditions, ice melts and water freezes at the same temperature.

Voltage is the force which pushes electrons through wires.

Two 90-decibel sound sources are turned on at the same time. Together they create a 180-decibel sound level.

Jane reads that passing a current of 100 milliamps through a person’s body from one hand to the other can be fatal. She accidentally grabs the positive terminal of her car’s battery in one hand and the negative in the other. Her car has a 12-volt battery rated for 100 amps. What will happen to her

Ben travels to a distant planet. In outerspace, with essentially no gravity, he can throw a baseball (mass = 0.5 kg) and a shot put (mass = 4 kg) at the same speed with no discernable difference in effort.

The force between your feet and the floor is greater while standing on your tiptoes than while standing flat on your feet.

Running a ceiling fan in an enclosed room during the summer will (assuming no heat transfer in or out):