Ask question

Ask question

All categories

3 years ago

5

A negatively charged object is brought near the knob of a negatively charged electroscope. The leaves of the electroscope will..

.
A) become positively charged
B) move closer together
C) become neutral
D) move farther apart

1 answer:

vladimir1956 [14]3 years ago

5 0

Move farther apart because like charges repel each other.

You might be interested in

Q10. Explain the Retention time, in GC. What will happen to retention time, if you increase the detector temperature

nadya68 [22]

Answer:

The detector temperature doesn't affect retention time

Explanation:

Retention time is one of the chromatographic parameters. Is defined as the time of a compound spends from injection to detection.

A solute in GC is added to the injector where is volatilized. When volatilized, it pass through a column until the detector.

The detector temperature doesn't affect retention time. To change retention time you must change injector temperature or column temperature. An increase in column or injector temperature results in a decrease in retention time.

4 0

3 years ago

Why is the position vs. time graph for an object in free fall a curve?

Ymorist [56]

Under free fall, the object is falling with a velocity that is increasing uniformly. Since the gradient of position-time graph reflects the velocity, the gradient is increasing, i.e. curve.

7 0

3 years ago

A student decides to give his bicycle a tune up. He flips it upside down (so there's no friction with the ground) and applies a

aleksklad [387]

Answer:

$V=9.2565m/s$

Explanation:

From the question we are told that:

Force $F = 34 N$

Time $t = 0.6 s$

Length of pedal $l_p=16.5cm \approx0.165m$

Radius of wheel $r = 33 cm = 0.33 m$

Moment of inertia, $I = 1200 kgcm2 = 0.12 kg.m2$

Generally the equation for Torque on pedal $\mu$ is mathematically given by

$\mu=F*L\\\mu=34*0.165$

$\mu=5.61N.m$

Generally the equation for angular acceleration $\alpha$ is mathematically given by

$\alpha=\frac{\mu}{l}$

$\alpha=\frac{5.61}{0.12}$

$\alpha=46.75$

Therefore Angular speed is \omega

$\omega=\alpha*t$

$\omega=(46.75)*(0.6)$

$\omega=28.05rad/s$

Generally the equation for Tangential velocity V is mathematically given by

$V=r\omega$

$V=(0.33)(28.05)$

$V=9.2565m/s$

5 0

3 years ago

¿Qué trabajo hace una fuerza de 110 N cuando mueve su punto de aplicación 20 mt en su misma dirección? *

lys-0071 [83]

Answer:

W = 2.200 Joules

Explanation:

Datos (data):

Fuerza [force] (F) = 110 N
Metros [meters] (m) = 20 m
Trabajo [work] (W) = ?

Usar la fórmula (use formula):

$\boxed{\bold{W = F*d}}$

Reemplazar (replace):

$\boxed{\bold{W = 110\ N*20\ m}}$

Resolver la multiplicación, recuerda que 1 N * 1 m = 1 J (resolve the multiplication, remember that 1 N * 1 m = 1 J:

$\boxed{\boxed{\bold{W =2.200\ J}}}$

Greetings.

7 0

3 years ago

What is the acceleration caused by gravity on earth

arlik [135]

Answer:

Explanation:

It's 9.8 m/s^2

4 0

3 years ago