Ask question

Ask question

All categories

3 years ago

5

What does it mean to say that the average speed of a car is 35 miles per hour?

1 answer:

LenKa [72]3 years ago

6 0

It means that the car has covered

(35 miles) x (the number of hours since it started traveling).

At some points during that time, the car was most likely moving
faster or slower than 35 miles per hour. We don't know. We only
know that it covered (35 miles) x (the number of hours since it left).

You might be interested in

To what temperature will a 79.0 g piece of glass raise if it absorbs 9457 calories of heat and its specific heat capacity is 0.5

ruslelena [56]

Answer:

T_final = 279.4 [°C]

Explanation:

In order to solve this problem, we must use the following equation of thermal energy.

$Q=m*C_{p}*(T_{f}-T_{i})$

where:

Q = heat = 9457 [cal]

m = mass = 79 [g] = 0.079 [kg]

Cp = specific heat = 0.5 [cal/g*°C]

T_initial = initial temperature = 40 [°C]

T_final = final temperature [°C]

$9457 = 79*0.5*(T_{f}-40)\\239.41=T_{f}-40\\\\T_{f}=279.4[C]$

8 0

3 years ago

Weddell seals make holes in sea ice so that they can swim down to forage on the ocean floor below. Measurements for one seal sho

Mariulka [41]

Answer:

B. 1 m/s

Explanation:

Metric unit conversions:

0.3 km = 300m

5 minutes = 5*60 = 300 seconds

So if a seal can reach a depth of 300m in a time of 300 seconds, its diving speed is the distance divided by time duration

v = s/t = 300/300 = 1m/s

So B is the correct answer

3 0

3 years ago

Terry, a 70-kilogram tailback, runs through his offensive line at a speed of 7.0 m/sec. Jared, a 100-kilogram linebacker, runnin

Vilka [71]

Terry will be thrown back due to Jared's larger mass. Larger mass= larger inertia

4 0

3 years ago

A solenoid 1.39 m long and 3.20 cm in diameter carries a current of 17.1 A. The magnetic field inside the solenoid is 26.9 mT. F

Mariulka [41]

Explanation:

It is given that,

Length of the solenoid, l = 1.39 m

Diameter of the solenoid, d = 3.2 cm = 0.032 m

Radius of solenoid, r = 0.016 m

Magnetic field inside the solenoid, $B=26.9\ mT=26.9\times 10^{-3}\ T$

We need to find the length of the wire forming the solenoid. The magnetic field inside the solenoid is given by :

$B=\mu_o nI$

n is number of turns per unit length

$B=\dfrac{\mu_o NI}{l}$

$N=\dfrac{Bl}{\mu_o I}$

$N=\dfrac{26.9\times 10^{-3}\times 1.39}{4\pi \times 10^{-7}\times 17.1}$

N = 1740.04

The total length having N loop is,

$L=2\pi r\times N$

$L=2\pi \times 0.016\times \times 1740.04$

L = 174.92 m

So, the length of the wire forming the solenoid is 174.92 meters. Hence, this is the required solution.

7 0

4 years ago

DENIUS [597]

Answer:

in the statement of account very seriously

5 0

3 years ago