At which point should a researcher inform the respondents about the use of deception in a psychological study ??

A cannonball is fired horizontally with an initial velocity of 20 m/s off a cliff that is 10 m from the ground. if the initial v

Dominik [7]

Consider the motion of the cannonball along the vertical direction or y-direction.

$v_{oy}$ = initial velocity along the Y-direction

$a_{y}$ = acceleration due to gravity

t = time of travel

Y = vertical displacement

Using the kinematics equation

Y = $v_{oy}$ t + (0.5) $a_{y}$ t²

since the ball has been launched horizontally , $v_{oy}$ = 0

Y = (0) t + (0.5) $a_{y}$ t²

t = $\frac{2Y}{a_{y}}$

hence the time of travel is independent of the initial velocity. hence the time of travel remain same.

Consider the motion along the horizontal direction

$v_{ox}$ = initial velocity along the X-direction

$a_{x}$ = acceleration along the horizontal direction = 0

t = time of travel

X = horizontal displacement

Using the kinematics equation

X = $v_{ox}$ t + (0.5) $a_{x}$ t²

since the ball has been launched horizontally , $a_{x}$ = 0

X = $v_{ox}$ t + (0.5) (0) t²

X = $v_{ox}$ t

hence the horizontal distance directly depends on the velocity. so the horizontal distance will become double.

C) The time won't change, but horizontal distance will double.

8 0

3 years ago

Read 2 more answers

Cars with hybrid and electric motors what?

kogti [31]

Are silent run on power and have to be electricly charged

5 0

3 years ago

At what distance along the z-axis is the electric field strength a maximum?

Lesechka [4]

The axial field is the integration of the field from each element of charge around the ring. Because of symmetry, the field is only in the direction of the axis. The field from an element ds in the ring is

dE = (qs*ds)cos(T)/(4*pi*e0)*(x^2 + R^2) 

where x is the distance along the axis from the plane of the ring, R is the radius of the ring, qs is the linear charge density, T is the angle of the field from the x-axis. 

However, cos(T) = x/sqrt(x^2 + R^2) 

so the equation becomes 

dE = (qs*ds)*[x/sqrt(x^2 + R^2)]/(4*pi*e0)*(x^2 + R^2) 

dE =[qs*ds/(4*pi*e0)]*x/(x^2 + R^2)^1.5 

Integrating around the ring you get 

E = (2*pi*R/4*pi*e0)*x/(x^2 + R^2)^1.5 

E = (R/2*e0)*x*(x^2 + R^2)^-1.5 

we differentiate wrt x, the term R/2*e0 is a constant K, and the derivative is 

dE/dx = K*{(x^2 + R^2)^-1.5 +x*[(-1.5)*(x^2 + R^2)^-2.5]*2x} 

dE/dx = K*{(x^2 + R^2)^-1.5 - 3*x^2*(x^2 + R^2)^-2.5} 

to find the maxima set this = 0, giving 

(x^2 + R^2)^-1.5 - 3*x^2*(x^2 + R^2)^-2.5 = 0 

mult both side by (x^2 + R^2)^2.5 to get 

(x^2 + R^2) - 3*x^2 = 0 

-2*x^2 + R^2 = 0 

-2*x^2 = -R^2 

x = (+/-)R/sqrt(2)

4 0

4 years ago

Now set the tension to low and wiggle the wrench to create more waves. Can you explain how moving the first point on the string,

Hatshy [7]

Answer:

When the string moves, it creates a very small change in the distance to the next point, th

Explanation:

When the string moves, it creates a very small change in the distance to the next point, this generates a restoring force that tends to push the string back, this small disturbance propagates along the string and is what creates the pulse.

This is similar to what happens when a spring is stretched and a restoring force is generated shaved by the law of shortening.

F = k Dx

4 0

3 years ago

Read 2 more answers

What scientists do that is the basis of their investigations

matrenka [14]

The "scientific method" consists of forming a hypothesis (a statement about what the researchers think is true), collecting data that might confirm or refute the hypothesis, and then examining the data to see how well or poorly they support the original hypothesis.

3 0

4 years ago