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3 years ago

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an object is moving in a straight line with a constant acceleration initially it is traveling at 16 meters per second. 3 seconds

later it is traveling at 10 meters per second. a) how far does it move during this time? B) how far does it move during half the time?

1 answer:

VLD [36.1K]3 years ago

4 0

A)It moved 6 meters.

B)It would 3 meters.

I think this is the answer.

Have a good day.

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An object of mass m = 2.9 g and charge Q = +42 µC is attached to a string and placed in a uniform electric field that is incline

Alisiya [41]

(a)
<span>F= qE </span>

<span>F sin 30.0° = mg </span>
<span>= 0.0026(10) </span>
<span>= 0.026 N </span>
<span>F = 0.052 N </span>

<span>E = F/q = 0.052 / 60µ = 867 N/C </span>

<span>(b) </span>
<span>T = F cos 30.0° </span>
<span>= 0.0450 N</span>

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3 years ago

A magnetic field is used to suspend a wire of mass 0.05 kgkg and length 0.16 mm . The wire is carrying a current of 11 AA . What

pochemuha

Answer:

$B=0.27840\ T$

Explanation:

Given:

mass of the wire, $m=0.05\ kg$

length of the wire, $L=0.16\ m$

current in the wire, $I=11\ A$

Now form the Lorentz force we know that every current carrying wire experiences a magnetic force on it due to the magnetic field components perpendicular to it.

Mathematically given as:

$F=I.L\times B$

$m.g=I.L\times B$

here: we nee to balance the gravitational force on the mass.

$B=$ magnetic field

$0.05\times 9.8=11\times 0.16\times B$

$B=0.27840\ T$

This magnetic field must be perpendicular to the direction of current in the wire and the these two directional quantities must lie in a plane normal to the direction of gravity according to the Fleming's left hand rule.

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3 years ago

Of the 50 U.S. states, 4 have names that start with the letter W.

professor190 [17]

Answer:

8%

Explanation:

Divide 4 by 50,

4/50=0.08

0.08 as a percent is 8%

8 0

3 years ago

Read 2 more answers

What is the velocity of an object that has a momentum of 4,000 kg-m/s and a mass of 115 kg? Round to the nearest hundredth.

iren [92.7K]

Answer:

B. 34.78 m/s

Explanation:

Momentum of a body or an object is given as the product of its velocity and its mass.

Therefore;

Momentum= velocity x mass

But; velocity = ? mass =115 kg , momentum = 4,000 kgm/s

Thus; velocity= momentum/mass

= 4,000/115

= 34.78 m/s

6 0

3 years ago

An object moving in circular motion has a mass of 15 kg and a centripetal acceleration of 10 m/s2. What is the centripetal force

sweet-ann [11.9K]

Answer:

1) A

2) C

3) B

4) A

5) Incomplete information(picture missing)

6) Incomplete information(picture missing)

7) Incomplete information(picture missing)

8) A

9) C

10) C

Explanation:

1) m = 15kg, a = $10ms^{-2}$ , F = ma = 15*10 = 150N

2) m = 3kg, v = $4ms^{-1}$ , r = 4m, F = $\frac{mv^{2} }{r}$

$\frac{3*4^{2} }{4}$ = 12N

3) a = $10ms^{-2}$ , r = 10m, v=?

F = $\frac{mv^{2} }{r}$ and F = ma

equating the two equations and cancelling a, we have:

$\frac{v^{2} }{r}$ = a

making v the subject of formula, we have:

v = $\sqrt{ar}$

= $\sqrt{100}$

= 10 $ms^{-1}$

4) r = 10m, v = $5ms^{-1}$ , a = ?

F = $\frac{mv^{2} }{r}$

F = ma

equating the above equations and making a subject of formula, we get:

a = $\frac{v^{2} }{r}$

a = 25/10 = 2.5 $ms^{-2}$

5) I can't find the picture associated with this question

6) I can't find the picture associated with this question

7) I can't find the picture associated with this question

8) F = $\frac{mv^{2} }{r}$

assuming m and r is unity, that is the values are 1 respectively, the formula simplifies to:

F = $v^{2}$

Now, if v is tripled

F = $(3v)^{2}$

F = 9 $v^{2}$

We can see that the force will be 9X greater than it was.

9) F = $\frac{mv^{2} }{r}$

assuming m and r is unity, that is the values are 1 respectively, the formula simplifies to:

F = $v^{2}$

Now, if v is doubled

F = $(2v)^{2}$

F = 4 $v^{2}$

We can see that the force will be 4X greater than it was.

10) F = $\frac{mv^{2} }{r}$

assuming m and v is unity, that is the values are 1 respectively

F = 1/r

if r is doubled,

F = 1/2 * 1/r

We can see that the force is 1/2 as big as it was

7 0

3 years ago