Answer:
A control should have been included in the investigation
Explanation:
It is impossible for the student to interpret a correct conclusion about his experiment, without adding a control treatment where he can really compare the differences between the variables.
Control treatment is an element of research that receives all factors, except the variable being tested. The control serves to make comparisons with the other treatments, allowing to observe the exact difference between a system where the variable was tested and the system where it was not.
In the case of the question above, it would have been necessary for the student to have placed a cart on a ramp of normal height and without sandpaper. That way he could compare the speed between this cart and the carts on the other ramps, thus having a correct result.
Federal government was given with exclusive powers by the US Constitution.
Explanation:
US had applied Trias politica which means the three powerful segments of government. The central government is given the power to declare war on nations, collect taxes, regulates the money printing, regulating or establishing international commercial and trade relationships with other countries.
Make international treaties and scheme out foreign policies. Provide army and navy assistance, charter banks and corporations, federal funding for general welfare. Deciding borders between the states and countries. Power to create courts and judiciary authorities for giving judgments.
