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
alexgriva [62]
3 years ago
13

A wave has a wavelength of 7 mm and a frequency of 19 hertz. What is its speed?

Physics
1 answer:
ASHA 777 [7]3 years ago
4 0

Speed = (frequency) x (wavelength)

Speed = (19 per second) x (7 mm)

Speed = (19 x 7) (per second · mm)

<em>Speed = 133 mm/sec</em>

or you might want to write  <em>Speed = 0.133 m/s</em> .

You might be interested in
A wheel has a rotational inertia of 16 kgm2. Over an interval of 2.0 s its angular velocity increases from 7.0 rad/s to 9.0 rad/
german

Answer:

<h2>128.61 Watts</h2>

Explanation:

Average power done by the torque is expressed as the ratio of the workdone by the toque to time.

Power = Workdone by torque/time

Workdone by the torque = \tau \theta = I\alpha * \theta

I is the rotational inertia = 16kgm²

\theta = angular\ displacement

\theta = 2 rev = 12.56 rad

\alpha \ is \ the\ angular\ acceleration

To get the angular acceleration, we will use the formula;

\alpha = \frac{\omega_f^2- \omega_i^2}{2\theta}

\alpha = \frac{9.0^2- 7.0^2}{2(12.54)}\\\alpha = 1.28\ rad/s^{2}

Workdone by the torque = 16 * 1.28 * 12.56

Workdone by the torque = 257.23 Joules

Average power done by the torque = Workdone by torque/time

=  257.23/2.0

= 128.61 Watts

8 0
3 years ago
You need to pull up the cart up this ramp. How would you change this ramp so it is easier to pull the cart up?
natali 33 [55]
I would make the ramp flatter. In doing so the ramp would have to be longer.
6 0
3 years ago
7) T F If two forces of equal magnitude act on an object that is hinged at a pivot, the force acting farther from the pivot must
saul85 [17]

Answer:

False

Explanation:

The torque exerted by a force is given by:

\tau=Fd sin \theta

where

F is the magnitude of the force

d is the distance between the point of application of the force and the pivot

\theta is the angle between the directions of F and d

We see that the magnitude of the torque depends on 3 factors. In this problem, we have 2 forces of equal magnitude (so, equal F). Moreover, one of the forces (let's call it force 1) acts farther from the pivot than force 2, so we have

d_1 > d_2

However, this does not mean that force 1 produces a greater torque. In fact, it also depends on the angle at which the force is applied. For instance, if the first force is applied parallel to d, then we have

\theta_1 =0\\sin \theta=0

and the torque produced by this force would be zero.

So, the statement is false.

4 0
3 years ago
Which of the following statements apply to electric charges? please help this is the only question i need done!!
disa [49]

The only correct statement on that list is <em>choice-C</em>:  If a positively charged rod is brought close to a positively charged object, the two objects will repel.

8 0
3 years ago
Read 2 more answers
Which statement describes how Earth compares to the moon? Earth has more inertia than the moon. The moon has more gravitational
Juliette [100K]

Answer

Earth has more inertia than the moon.

6 0
3 years ago
Read 2 more answers
Other questions:
  • If your a member of the u.s. navy your organization is part of the department of what?
    15·1 answer
  • A girl on a skateboard going around a corner at a speed of 3 m/sec.
    15·1 answer
  • How do fossils provide evidence that evolution has occurred?
    9·1 answer
  • Suppose you observe that at night, the air just above the ground feels cooler than the air above it. then in the middle of a sun
    15·1 answer
  • A 2.1 kg block is dropped from rest from a height of 5.5 m above the top of the spring. When the block is momentarily at rest, t
    8·2 answers
  • In a standard tensile test a steel rod of 22-mm diameter is subjected to a tension force of 75kN. Knowing that v = 0.30 and E =
    13·2 answers
  • The potential energy of a 1.7 x 10-3 kg particle is described by U (x )space equals space minus (17 space J )space cos open squa
    7·1 answer
  • 1. ________________electricity is the type of electricity commonly used in homes and businesses throughout the world.
    6·1 answer
  • The diagram below depicts all the forces acting on an object. Use both vector resolution and vector
    12·1 answer
  • Can aurora be found in other planets?
    5·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!