Answer: option A: What is the proper number of children to have in today's family?
A scientific investigation includes a scientific method to approach a problem. There is a systematic approach is used to address a problem. It generally includes five steps: first a problem needs to be identified. Thereafter, a background research is important to form a hypothesis. Fourthly, an experiment, observation or measurements are done in order to draw conclusions at last.
From the given questions, option A is a question which cannot be scientifically investigated. This is because, it varies from individual to society to the economy of a state. The conclusion would not be generalized solution.
option B.Will equal sizes of Styrofoam and wood have the same mass? can be scientifically investigated. The given quantities can be measured and tested.
C. Does adding salt to water raise its boiling point? This can be scientifically tested
D. Does lack of sunlight affect plant growth? This can also be scientifically measured.
A car uses ____________________________ to move. Select one: a. energy b. pulls c. motion d. work
The correct answer is Option A.
The car uses energy to move.
A car is a machine that converts energy locked in fuel like petrol or diesel and turn it into mechanical energy.
The energy produced from the combustion of gasoline is then used to move the shaft, which sends the power to the rear axle and the wheel starts to move.
Work is done on an object when an applied force causes the object to move in the same direction as the force.
Work is done on an object when an applied force causes the object to move in the same direction as the force
A stunt car with a mass of 1000 kg crashes into a tree on a movie set during the collision acceleration of the car with 3 m what was the force of impact of the collision on the car
You spill a bucket of soapy water on a marble floor accidentally.Would it make it easier or difficult for you to walk on the floor? and why ? (Briefly describe your answer)
It would make it difficult for you to walk on the floor.
Spilling a bucket of soapy water on a marble floor will significantly reduce the coefficient of friction between the floor and your shoes. In this way, even though your weight puts pressure on the floor, the contact surface between the material of your shoes and the floor won't be enough to safely walk on it without losing stability. The layer of soapy water will become a barrier between the two materials.
Of course harder
Just imagone the floor is wet and you walk on it, do u feel it hard or easy to walk? :D