Answer:
Explanation:
Given
launch velocity 
Launch angle 
Range of Projectile 
Horizontal velocity remain same and only vertical velocity changes.
Initially vertical velocity is in upward direction but as soon as it reaches the ground its direction change but magnitude remain same.
Answer:
D. Test a cell phone's reception in the exact same location under various atmospheric conditions
Explanation:
Components of an experiment:
Independent variable:
A manipulated variable, in an experiment or study, whose presence or degree incurs a change in the dependent variable.
Dependent variable:
A variable which is being studied in the experiment and is supposed to change with respect to the independent variable.
Control variable:
Control variable includes the variables which are of no concern in the experiment and must be constant so that they do not interfere with the results of the experiment. Change in control variable might affect the results of an experiment.
In Anna's experiment, the independent variable is the atmospheric conditions. The dependent variable is cell phone reception that will change according to the atmospheric conditions. All other things related to the experiment are control variables like cellphone, location of the cell phone. Both of these must stay constant to collect the best data.
Hence, the best option is D.
2: It's not just the capillary action, but the pull from transpiration (the evaporation of water from the tree) that is used to pull water up from the roots.
<span>The second question needs context. Strong bonds alone won't cause tension. I don't see how adhesion is different. High vapour pressure could do it, but it's the difference in pressures that'd cause tension (and the resistance of that pressure by the surface). So, a low and high pressure would be needed. Poorly worded question :( </span>
<span>1: "Adhesion is the tendency of certain dissimilar molecules to cling together due to attractive forces." [1] </span>
<span>3: The other three answere would not work. Think of a boat. </span>
<span>3: If you push gas, it will be compressed(get smaller). If you push liquid it will push something else. Thus, liquids are good for transferring force. This is a hydraulic system.</span>
The air pressure inside the balloon increases as the number of particles increases.
Answer:
The gravitational force between the sun and the earth drops to (1/16) of its original value.
Explanation:
According to the gravitational law, gravitational force between two bodies is directly proportional the product of the masses of the two bodies and inversely proportional to the square of their distances apart.
If the two masses and the other constants of proportionality are held constant, the gravitational force between two bodies is inversely proportional to the square of their distances apart.
F ∝(1/R²)
If the initial gravitational force between the sun and the earth is given by F₀ and the distance between the sun and the earth is R₀.
F₀ = (k/R₀²)
where k is constant regardless of the values of corresponding gravitational forces and distances apart.
Then, let the new distance apart be R₁,
R₁ = 4 R₀
The new gravitational force between the sun and the earth, F₁ will be given by
F₁ = k/(R₁²)
Recall, R₁ = 4 R₀
F₁ = k/(4R₀)² = k/16(R₀²) = F₀/16
Hence, the gravitational force between the sun and the earth drops to (1/16) of its original value.
