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3 years ago

6

An oscillator makes four vibrations in one second. What is its period and frequency

1 answer:

erica [24]3 years ago

4 0

Its frequency is ... exactly as you said ... four per second (4 Hz). Its period is the reciprocal of that ... 1/4 second per vibration.

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My trip to work is 120 miles. if i go 8 mph faster than my usual speed, i'll get to work 30 minutes earlier. how long does my tr

forsale [732]

Let x be the time it takes for the trip to be completed given that the speed is y.

When the time is 30 minutes (equal to 0.5 hour) shorter than x, the speed is 8 mph more than the original speed.

The equations that would best represent the given conditions are:
(1) 120 = (x)(y)
(2) 120 = (x - 0.5)(y + 8)

Simplifying,
y = 120/x
Substitute:
120 = (x - 0.5)(120/x + 8)

The value of x from the equation is 3. Thus, if I go with the usual speed, the time it will take me to finish the trip is approximately 3 hours.

7 0

4 years ago

Read 2 more answers

You wish to buy a motor that will be used to lift a30-kg bundle of shingles from the ground to the roof of a house. The shingles

hodyreva [135]

Answer:

the minimum value of torque is 101.7 N-m.

Explanation:

Given that,

Mass of bundle of shingles, m = 30 kg

Upward acceleration of the shingles,

The radius of the motor of the pulley, r = 0.3 m

Let T is the tension acting on the shingles when it is lifted up. It can be calculated as :

T-mg=ma

T=m(g+a)

$T=10\times (9.8+1.5)\\T = 113 N$

Let $\tau$ is the minimum torque that the motor must be able to provide. It is given by :

$\tau=r\times T\tau=0.3\times 339\tau=101.7\ N-m$

the minimum value of torque is $101.7 N-m.$

6 0

3 years ago

When developing an experimental design, which action could a scientist take

NNADVOKAT [17]

Answer:

B.Include as many details as possible when writing the conclusion.

This helps improve the quality of their experiment..

_Askmeanything2♡

6 0

3 years ago

A 0.200-kilogram ball A is traveling at a velocity of 2 meters/second. It hits a 1-kilogram stationary ball B. Which statement i

ioda

As we know that collision is elastic so we will have

$e = 1 = \frac{v_2 - v_1}{2 - 0}$

$v_2 - v_1 = 2 m/s$

also we can use momentum conservation

$P_{1i} + P_{2i} = P_{1f} + P_{2f}$

$0.200(2m/s) + 0 = 0.200 v_1 + 1v_2$

$0.4 = 0.2v_1 + v_2$

now from above two equations we will have

$1.2 v_1 = -1.6$

$v_1 = -1.33 m/s$

also we have

$v_2 = 0.66 m/s$

so both balls will separate after collision and move in opposite direction as the final velocities are opposite in sign

So correct answer will be

<em>D. The balls separate and move in opposite directions.</em>

8 0

3 years ago

Every action force has an opposite and equal reaction force. Determine which of these are action/reaction pairs. Check all that

denis23 [38]

A girl leans against a wall and the wall pushes on the girl.

A baseball hits a glove and the glove pushes on the ball.

A cat rubs up against a tree and the tree pushes against the cat

3 0

4 years ago

Read 2 more answers