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
Andrew [12]
3 years ago
14

A karate master wants to break a board by hitting the board swiftly with his hand. The master's hand has a mass of 0.30 kg, and

as it strikes the board, his hand has a velocity of 23.3 m/s. The master contacts the board for 0.0050 seconds.
Physics
1 answer:
slava [35]3 years ago
6 0

Answer:

f=-1380N

Explanation:

A karate master wants to break a board by hitting the board swiftly with his hand. The master's hand has a mass of 0.30 kg, and as it strikes the board, his hand has a velocity of 23.3 m/s. The master contacts the board for 0.0050 seconds

.the concluding part to the question should be

What is the impact force (impulse) on the board?

solution

from the Newton's second law of motion which states that

the rate of change in momentum is directly proportional to the force applied

f=m(v-u)/t

f=0.3(0-23.3)/0.005

f=-1380N

f=force impact

m=mass of the karates master's hand

t=time for the impact

v=0m/s final velocity

u=initial velocity

You might be interested in
Plsss hlppppppp!!!!!!!!!!!!!
masya89 [10]

Explanation:

The angular momentum is doubled because it is proportional to the angular velocity.

6 0
2 years ago
A pickup truck is traveling down the highway at a steady speed of 30.1 m/s. The truck has a drag coefficient of 0.45 and a cross
Sav [38]

Answer:

The energy that the truck lose to air resistance per hour is 87.47MJ

Explanation:

To solve this exercise it is necessary to compile the concepts of kinetic energy because of the drag force given in aerodynamic bodies. According to the theory we know that the drag force is defined by

F_D=\frac{1}{2}\rhoC_dAV^2

Our values are:

V=30.1m/s

C_d=0.45

A=3.3m^2

\rho=1.2kg/m^3

Replacing,

F_D=\frac{1}{2}(1.2)(0.45)(3.3)(30.1)^2

F_D=807.25N

We need calculate now the energy lost through a time T, then,

W = F_D d

But we know that d is equal to

d=vt

Where

v is the velocity and t the time. However the time is given in seconds but for this problem we need the time in hours, so,

W=(807.25N)(30.1m/s)(3600s/1hr)

W=87.47*10^6J (per hour)

Therefore the energy that the truck lose to air resistance per hour is 87.47MJ

4 0
3 years ago
You could use an analytical or triple beam balance to determine a ___ called ____
GaryK [48]

Answer:

a and b are the correct answers

Explanation:

7 0
3 years ago
Read 2 more answers
Suppose that a star has a spectrum that includes red, blue, and violet lines spaced in the pattern of the lines from hydrogen bu
ladessa [460]

Answer:

It can be concluded that the star is moving away from the observer.

Explanation:

Spectral lines will be shifted to the blue part of the spectrum if the source of the observed light is moving  toward the observer, or to the red part of the spectrum when is moving away from the observer (that is known as the Doppler effect).

The wavelength at rest for this case is 434 nm and 410 nm (\lambda_{0} = 434nm, \lambda_{0} = 410nm)

Redshift: \lambda_{measured}  >  \lambda_{0}

Blueshift: \lambda_{measured}  <  \lambda_{0}

Since, \lambda_{measured} (444nm) is greater than \lambda_{0} (434 nm) and \lambda_{measured} (420nm) is greater than \lambda_{0} (410 nm), it can be concluded that the star is moving away from the observer

6 0
3 years ago
Which has more momentum, a heavy truck moving at 30 miles per hour or a light truck moving at 30 miles per hour?
valentina_108 [34]
A heavy truck moving a 30 mph. It has more mass.
7 0
3 years ago
Read 2 more answers
Other questions:
  • Which of the following is not affect by muscles a blood temperature b digestion c hair growth d speech
    6·1 answer
  • Suppose astronomers built a 150-meter telescope. how much greater would its light-collecting area be than that of the 10-meter k
    9·1 answer
  • We have discovered some exoplanets that are still forming from a nebula. How might those planets change over time?
    8·1 answer
  • Reading or writing on a phone is especially dangerous while driving because:
    11·2 answers
  • Imagine that the Earth had no atmosphere and was covered with a material that was a perfect thermal insulator (and zero thermal
    7·1 answer
  • Nuclear reactors use fuel rods to heat water and generate steam. Is this process endothermic or exothermic?
    7·2 answers
  • The portion of electromagnetic spectrum is occupied by signal is called ​
    15·1 answer
  • A car travels 300km in six hour. What is the average speed
    13·1 answer
  • If the velocity is 50 and the time is 5 seconds what is the acceleration?
    5·1 answer
  • A wire that is 1.0 m long with a mass of 90 g is under a tension of 710 N. When a transverse wave travels on the wire, its wavel
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!