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3 years ago

A student tries to measure the period of a pendulum that is already swinging

Physics

1 answer:

Alex17521 [72]3 years ago

5 0

Answer:

a. The student's mistake was that the student did not swing the pendulum and start the watch at the same time.

b. 1.2 s per swing.

c. The likely effect of her reaction time is that they will should subtract two seconds off the time.

Explanation:

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Jose is batting for the home team when he hits a foul ball that rises straight up over home plate. A fan in the stands notices t

andreyandreev [35.5K]

Answer:

Explanation:

Given maximum height reached by the ball as H = 40 metres

Since the ball rises straight up when hit by a ball, then the angle of launch will be perpendicular to the ground and that is 90°.

To determine the upward speed of the ball in meters per second after it got struck by the bat, we will use the formula for calculating the maximum height according to projectile motion;

Maximum Height H = $\frac{u^2sin^2\theta}{2g}$ where;

u is the speed of the ball

$\theta$ is the angle of launch

g is the acceleration due to gravity = 9.81m/s²

Substituting the given parameters into the formula;

$40 = \frac{u^2sin^2(90)}{2(9.81)}\\ \\40 = \frac{u^2}{2(9.81)}\\ \\40 = \frac{u^2}{19.62} \\cross\ multiply\\\\u^2 = 40*19.62\\u^2 = 784.8\\u = \sqrt{784.8}\\ u = 28.01 m/s$

<em>Hence the upward speed of the ball in meters per second after it got struck by the bat is 28.01m/s.</em>

5 0

3 years ago

Which of these statements describes what occurs in facilitated diffusion?-Facilitated diffusion requires energy from the cell to

Softa [21]

Answer:

Facilitated diffusion of solutes occurs through protein pores in the membrane.

Explanation:

Facilitated diffusion: It is known as a type a passive transport which diffuses the solutes through specific trans membrane integral proteins in the plasma membrane. Transport proteins helps in diffuse some ions, and molecules across the plasma membrane.

There are three types of transport proteins which are involved in this diffusion:

1) gated channel proteins.

2) carrier proteins.

3) channel proteins.

Some example of facilitated diffusion are: glucose transporter, ion channels, and aquaporins.

6 0

3 years ago

Ocean waves are traveling to the east at 4.9 m/s with a distance of 23 m between crests. (b) With what frequency do the waves hi

ser-zykov [4K]

Answer:

0.26086 Hz

Explanation:

solution:

The relative speed of the wave is:

v = 4.9+1.1 = 6 m/s

the frequency is:

f = v/λ

= 6/23

= 0.26086 Hz

6 0

4 years ago

List 3 indicators that a chemical reaction has occurred.

mina [271]

Hello! There are many indicators to show a sign that a chemical reaction has occured. These are 3 as followed.

1. An odor is produced.

2. A change in temperature.

3. A color change.

Others can be a formation of a solid or a gas.

8 0

3 years ago

If a car has a velocity of 85 km/hr, how long will it take to accelerate to 45 km/hr if the acceleration is -3 km/hr/sec?

weqwewe [10]

Answer:

Time, t = 13.34 seconds.

Explanation:

Given the following data;

Initial velocity, u = 85km/hr to meters per seconds = 85*1000/3600 = 23.61 m/s

Final velocity, v = 45km/hr to meters per seconds = 45*1000/3600 = 12.5 m/s

Acceleration, a = -3 km/hr/sec to meters per seconds square = -3*1000/3600 = -0.833m/s²

To find the time;

Acceleration = (v - u)/t

-0.833 = (12.5 - 23.61)/t

-0.833t = -11.11

t = 11.11/0.833

Time, t = 13.34 seconds.

6 0

3 years ago