All categories

4 years ago

True or False?

Physics

1 answer:

DedPeter [7]4 years ago

8 0

Answer:

False. the system does not complete the circle movement

Explanation:

For this exercise, we must find the rope tension at the highest point of the path,

-T - W = m a

The acceleration is centripetal

a = v² / R

T = ma - mg

T = m (v² / R - g)

The minimum tension that the rope can have is zero (T = 0)

v² / R - g = 0

v = √ g R

Let's find out what this minimum speed is

v = √ 9.8 1

v = 3.13 m / s

We see that the speed of the body is less than this, so the system does not complete the movement.

You might be interested in

Refrigerant entering the compressor of a refrigeration system is a:________

schepotkina [342]

Refrigerant entering the compressor of a refrigeration system is sub-cooled liquid

The liquid refrigerant is sub-cooled to ensure that only liquid and not the vapour enters the throttling valve. In a refrigeration system, the superheating decreases COP increase refrigerating effect but increasing amount of work done. The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required. Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.

Learn more about sub-cooled here:

brainly.com/question/15014467

#SPJ4

7 0

2 years ago

A plane mirror forms a virtual image. give reasons

xenn [34]

Answer:

1. The reason why a plane mirror forms a virtual image is because it doesn't let the light go through it, but it reflects the light, so if you go behind the plane mirror, then you won't see the rays of light since it's not letting the rays of light go behind it.

2. The image cannot be projected onto a screen also.

3. Also, the Rays of light never meet at a focus point, so hence, this is why the plane mirror forms a virtual image.

Thanks!

4 0

2 years ago

Read 2 more answers

HELP PLEASE!! <br><br>what will happen if you add a stronger battery to an electromagnet?? <br><br>

Gala2k [10]

The electromagnetic force will be stronger since the electromagnet get it's force from the battery.

6 0

4 years ago

The weight of a metal bracelet is measured to be 0.10400 N in air and 0.08400 N when immersed in water. Find its density.

Anna007 [38]

Answer:

The density of the metal is 5200 kg/m³.

Explanation:

Given that,

Weight in air= 0.10400 N

Weight in water = 0.08400 N

We need to calculate the density of metal

Let $\rho_{m}$ be the density of metal and $\rho_{w}$ be the density of water is 1000kg/m³.

V is volume of solid.

The weight of metal in air is

$W =0.10400\ N$

$mg=0.10400$

$\rho V g=0.10400$

$Vg=\dfrac{0.10400}{\rho_{m}}$ .....(I)

The weight of metal in water is

Using buoyancy force

$F_{b}=0.10400-0.08400$

$F_{b}=0.02\ N$

We know that,

$F_{b}=\rho_{w} V g$ ....(I)

Put the value of $F_{b}$ in equation (I)

$\rho_{w} Vg=0.02$

Put the value of Vg in equation (II)

$\rho_{w}\times\dfrac{0.10400}{\rho_{m}}=0.02$

$1000\times\dfrac{0.10400}{0.02}=\rho_{m}$

$\rho_{m}=5200\ kg/m^3$

Hence, The density of the metal is 5200 kg/m³.

6 0

4 years ago

A dog travels 3m East and then 4m West, what is his displacement?

RideAnS [48]

Answer:

his displacement is 5m

Explanation:

A is the stage at which a man starts walking. He's walking 4 m north, i.e. AB, then going 3 m east, i.e. BC. The displacement is the connecting straight line between the original and the final position. The displacement is thus the AC hypotenuse of the right-angle triangle. By applying the theorem of hypotenuse, we get

⇒displacement=16+9−−−−−√=25−−√=5m

8 0

3 years ago