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3 years ago

A standard light bulb emits light rays in _________ directions. A. parallel B. opposite C. perpendicular D. nearly all

Physics

1 answer:

Lena [83]3 years ago

5 0

Well the answer is D nearly all because light bulbs are roundish

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This force will cause the path of the particle to curve. Therefore, at a later time, the direction of the force will ___________

melisa1 [442]

Answer:

have a component along the direction of motion that remains perpendicular to the direction of motion

Explanation:

In this exercise you are asked to enter which sentence is correct, let's start by writing Newton's second law.

circular movement

F = m a

a = v² / r

F = m v²/R

where the force is perpendicular to the velocity, all the force is used to change the direction of the velocity

in linear motion

F = m a

where the force is parallel to the acceleration of the body, the total force is used to change the modulus of the velocity

the correct answer is: have a component along the direction of motion that remains perpendicular to the direction of motion

8 0

3 years ago

During the hammer throw at a track meet, an 8.0 kg hammer is accidentally thrown straight up. If 784.0 J of

jeka57 [31]

The height risen by the hammer when the work were done is 10 m.

The given parameters;

Mass of the hammer, m = 8.0 kg
Work done on the hammer, W = 780 J

Apply work energy - theorem to determine the height risen by the hammer when the work is done on it;

$E = mgh\\\\h = \frac{E}{mg} \\\\h = \frac{784}{8 \times 9.8} \\\\h = 10 \ m$

Thus, the height risen by the hammer when the work were done is 10 m.

Learn more about work-energy theorem here: brainly.com/question/22236101

4 0

3 years ago

Pls help me w this, I've been doing this since 5 minutes ago

natka813 [3]

Answer:

t=0.0625s

Explanation:

F=number of swings/time taken

DATA

Frequency=4.0Hz

number of swings from Q to R

=1/4

time taken=?

Frequency=number of swings/time taken

make t the subject of the formula

t=n/f

substitute the given date

t=0.25/4.0

t=0.0625s

option A is collect

4 0

3 years ago

Silver is a white metal and is an excellent conductor of heat and electricity. The density of silver is 10.49 g/cm3. Silver does

padilas [110]

A is the answer. That is not a chemical property.

5 0

4 years ago

Read 2 more answers

A particle that is moving along a straight line accelerates from 40 cm/s to 20 cm/s in 5.0 s and then has a constant acceleratio

Marrrta [24]

Answer:

Average speed, $v_{avg}=43.33\ \rm cm/s$

Explanation:

Given:

Initial speed, u=40 cm/s
final speed , v=20 cm/s
Time taken, t=5 s

First case

Using equation of motion we have

$2as=v^2-u^2\\2as=20^2-40^2\\as=-600\\$

Now using,

$v=u +at\\20=40+a\times5\\a=-4\ \rm cm/s^2$

now putting the value of a in first equation we get

$s=150\ \rm cm$

Second case

Acceleration $a=20\ \rm cm/s^2$

Time taken $t=4\ \rm s$

using equation of motion in one Dimension we have

$s=ut+\dfrac{at^2}{2}\\\\s=20\ties 4+\dfrac{20\times 4^2}{2}\\s=240\ \rm cm$

Average speed is equal to total distance travelled per unit total time taken

$v_{avg}=\dfrac{150+240}{5+4}\\v_{avg}=43.33\ \rm cm/s$

4 0

4 years ago

Read 2 more answers