1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
STatiana [176]
3 years ago
10

Why should a tennis player "swing through" when hitting a tennis ball?​

Physics
1 answer:
kondaur [170]3 years ago
7 0

If a tennis player does not swing through, meaning they stop swinging the moment they make contact with the ball, they would lose the majority of their power. <em>The momentum that they had built up during the swing is lost the moment they stop swinging</em>, meaning that the ball is hit with a low amount of power.

<em>If the tennis player swings through the whole time they hit the ball, then they keep their momentum as they hit the ball.</em> There is a much higher power level when swinging through than if you were to stop your swing when you hit the ball.

You might be interested in
Which kind of knowledge to the people in the forest have ?​
stellarik [79]
The have the knowledge of a monkey, they survive like monkey, they become one with monkey okay seriously tho they probably have survival knowledge
5 0
3 years ago
What two physical processes balance each other to create the condition known as gravitational equilibrium in stars?
dusya [7]

Answer:

gravitational force and outward pressure

Explanation:

The stars are very massive stellar objects, so they have a strong gravitational force, which drives the star to contract itself, but also in stars there are nuclear reactions such as fusion of hydrogen and other elements, that releases energy and creates a pressure from the center to the star exterior, an outward pressure that goes against the gravitational force. So when a star is stable these two forces exist in equilibrium or in balance, in which the star does not collapse by gravity or disintegrate by its outward pressure.

3 0
3 years ago
A laser produces 20.0 mW of red light. In 1 hour, the laser emits 2.29 X 10^20 photons. What is the wavelength of the laser?
Butoxors [25]
Using Planck's equation,

E = nhc / λ

Also, Power = Energy / time
E = 20 x 10⁻³ x 60 x 60
E = 108 J

108 = (2.29 x 10²⁰ x 6.63 x 10⁻³⁴ x 3 x 10⁸) / λ
λ = 4.22 x 10⁻⁷ m
8 0
3 years ago
Students were asked to design a lab that would illustrate a concept that
g100num [7]

Answer:

<em>I</em><em> </em>think that the answer would be D.Given the diagram if you just see you will find that a lamp is projected in such a way that its light falls on the ice cubes so the ice would get a large magnitude of heat energy so the kinetic energy of the molecules increases and at a constant temperature(0°c) they would melt and gets transformed into tiny water doplets as we know if the light is continuous enabled on water droplets then at a certain time it would change into water vapours as we know that if any liquid gets evaporated up then it will only evaporate when it absorbs heat from its surrounding as doing so the surrounding along with glass box would get cool down and so the water vapours on air would also cool down and get condensed on outer glass box particles and if the glass box is porous in nature then the water droplets would fill the box

Hope it helps

6 0
3 years ago
Ilya and Anya each can run at a speed of 7.30 mph and walk at a speed of 4.00 mph. They set off together on a route of length 5.
katrin [286]

Answer:

a)0.9675 h

b)5.168 mph

c)0.885 h

d)5.65 mph

Explanation:

The distance travelled by a moving object can be calculated as the velocity multiplied by the time, for this problem we can divide the problem in two stages, one where the are walking and another where they run,

Considering the total time for Anya is t_{a}:

She first walks for half the distance (2.5 miles) so:

2.5 miles=V_{w}*t_{a1}

Solving for t_{a1}:

t_{a1}=\frac{2.5miles}{V_{w}}=\frac{2.5miles}{4 mph}=0.625 h

Then she runs the other half of the distance:

2.5 miles=V_{r}*t_{a2}

t_{a2}=\frac{2.5miles}{V_{r}}=\frac{2.5miles}{7.3 mph}=0.3425 h

Adding this two durations we have the total time it takes for Anya to cover the distance:

t_{a}=0.3425 h+0.625 h=0.9675 h

The average velocity can be calculated as the total distance divided by the total time:

V_{a-av} =\frac{5 miles}{0.9675 h} =5.168 mph

Considering the total time for Ilya is t_{I}:

She first walks for half the time so:

d_{I1}=V_{w}*t_{I}/2

Where V_{w} is the velocity when walking (same for both people). On the second half she runs:

d_{I2}=V_{r}*t_{I}/2

This two distances must sum the total distance 5 miles, so:

d_{I2}+d_{I2}=5 miles

replacing the expressions above:

V_{w}*t_{I}/2+V_{r}*t_{I}/2=(V_{w}+V_{r})*t_{I}/2=5 miles

t_{I}=\frac{5miles*2}{V_{w}+V_{r}}=\frac{10 miles}{4mph+7.3mph}=0.885 h

so it takes Ilya 0.885 hours to to cover the distance

The average velocity can be calculated as the total distance divided by the total time:

V_{I-av} =\frac{5 miles}{0.885 h} =5.65 mph

3 0
3 years ago
Other questions:
  • Peter, a 100 kg basketball player, lands on his feet after completing a slam dunk and then immediately jump up again to celebrat
    8·1 answer
  • A 10-kg rock and 20-kg rock are dropped from the same height and experience no significant air resistance. if it takes the 20-kg
    12·1 answer
  • What is the best energy source of electricity
    8·2 answers
  • When you see a traffic light turn red, you apply the brakes until you come to a stop. if your initial speed was 14 m/s, and you
    9·1 answer
  • If the moon is new as seen from the earth, what phase would the earth be in as seen by an astronaut on the moon? explain your re
    6·1 answer
  • Gauges all very according the vehicle , model make and year and other factors. By turning the vehicle to the ___ position you ca
    9·1 answer
  • The diagram below represents an electromagnetic wave. Please Help<br>​
    10·1 answer
  • How many milligrams in 1 gram. ??? HELP !!!
    8·2 answers
  • Write an expression to evaluate the relative error in g (given that g= 2h/t^2) in terms of h,Δh,t,Δt
    14·1 answer
  • Anyone willing to help?
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!