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Luba_88 [7]
3 years ago
11

A dog whistle has a higher frequency than humans can hear, but dogs can hear it because they can hear sounds with higher _____ t

han humans.
a. pitch
b. speed
c. altitude
d. amplitude
Physics
1 answer:
Mila [183]3 years ago
8 0
A. pitch
It can also be higher frequency
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A platinum sphere with radius 0.0139 m is totally immersed in mercury. Find the weight of the sphere, the buoyant force acting o
Inessa [10]

Answer:

A) W = 0.59 N

B) Buoyant Force = 0.37N

C) Apparent Weight = 0.22N

Explanation:

Volume of a sphere is givwn by;

V= (4/3)πr³

We are given radius r = 0.0139 m

Thus, V = (4/3)π(0.0139³)

V = 2.81237 x 10^(-6) m³

A) Weight of sphere, W= mg

where mass, m can be expressed as; m = Volume x density of platinum

m = 2.81237 x 10^(-6) x 2.14 × 10⁴ = 6.0185 x 10^(-2) kg

So, W = 6.0185 x 10^(-2) x 9.8

W = 0.59 N

B) Buoyant force = mg

where mass of displaced mercury m can be expressed as; m = Volume x density of mercury

m = 2.81237 x 10^(-6) x 1.36 × 10⁴

m = 3.825 x 10^(-2) kg

Thus, Buoyant force = 3.825 x 10^(-2) x 9.8 = 0.37N

C) Apparent weight = Weight of sphere - Buoyant force

Thus, apparent weight = 0.59 - 0.37 = 0.22N

8 0
3 years ago
Read 2 more answers
You take a trip that covers 240 kilometers and takes 4 hours. Your average speed is
Lorico [155]

Answer:

Your average speed is 60 kilometers per hour

Explanation:

240 divided by 4 is 60

240/4=60

7 0
3 years ago
The velocity of a ball as it is thrown up is 20 meters/second. It attains zero velocity after 3.5 seconds. What is the average a
Step2247 [10]

Change in speed = (speed at the end) minus (speed at the beginning)

                           =                    (0 - 20 m/s)  =  -20 m/s

Acceleration = (change in speed) / (time for the change)

                           =  (-20 m/s)      /   (3.5 sec)   =   -5.71 m/s²

Notice that this story probably didn't happen on Earth, because
the acceleration due to gravity on Earth is  9.8 m/s².
 
3 0
3 years ago
A wire is formed into a circle having a diameter of 11.1 cm and is placed in a uniform magnetic field of 2.79 mT. The wire carri
Ber [7]

Answer:

Maximum torque on the wire is 1.34\times 10^{-4}\ N-m

Explanation:

It is given that,

Diameter of the wire, d = 11.1 cm = 0.111 m

Radius of wire, r = 0.0555 m

Magnetic field, B=2.79\ mT=0.00279\ T

Current, I = 5 A

We need to find the maximum torque on the wire. Torque is given by :

\tau=IAB\ sin\theta

Torque is maximum when, \theta=90

\tau=IAB

\tau=5\times \pi \times (0.0555)^2\times 0.00279

\tau=0.000134\ N-m

or

\tau=1.34\times 10^{-4}\ N-m

So, the maximum toque on the wire is 1.34\times 10^{-4}\ N-m. Hence, this is the required solution.

6 0
3 years ago
What happens when white light shines through a translucent, red, glass window? a) All colors of light except red are transmitted
GREYUIT [131]

Answer:

b. Red light is transmitted through and reflected by the glass

Explanation:

Give me brainliest plz!

3 0
3 years ago
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