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Nina [5.8K]
2 years ago
7

A couple walking in the park strolls 1.5 km in 60 min. What is the couple’s average speed in m/h?

Physics
2 answers:
cricket20 [7]2 years ago
6 0

Answer:

0.932 m/h

Explanation:

Parameters given:

Distance walked by couple, D = 1.5 km

Time spent in walking, t = 60 min

To solve this we simply apply the formula for average peed:

Average Speed = total distance / total time taken

The question asks specifically to put the answer in miles per hour (m/h), hence, we need to convert the distance to miles and the time to hours:

Distance in miles:

1 km = 0.622 miles

1.5 km = 1.5 * 0.622 = 0.932 miles

Time in hours = 60 / 60 = 1 hour

Hence, the speed is:

Speed = 0.932 / 1 = 0.932 m/h

The average speed of the couple is 0.932 m/h

ch4aika [34]2 years ago
6 0

Answer:

1,500m/h

Explanation:

the information that we have is:

distance traveled: d=1.5km

to convert this quantity to meters we remember that 1km = 1,000m

so the distance in meters is:

d=1.5km(1000m/1km)\\d=1.5(1000)\\d=1,500m

and we also know the time

time: t=60min, and since 60min = 1hour, the time in hours is:

t=1h

now we use the formula for the average speed:

v=\frac{d}{t}

and we sustitute the known values (<u>since we want the answer to be in m/h we substitute the distance in meters (m) and the time in hours(h)</u>):

v=\frac{1,500m}{1h}\\ v=1,500m/h

the speed of the couple in m/h is: 1,500m/h

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a proton moves in a circle of radius 0.4 when it enters a region with a magnetic field of 1.0t which points into the plane the s
Genrish500 [490]

Answer:

4 x 10⁷m/s

Explanation:

When a charged particle moves in a curved path in a magnetic field, it experiences some magnetic force, and in the absence of any other force, which supplies the centripetal force needed to keep the particle in balance.

Let the magnetic force be F_{M}

Let the centripetal force be F_{C}

=> F_{M} = F_{C}           --------------(i)

We know that;

F_{M} = qvBsinθ

Where;

q = charge on the particle

v = speed of the particle

B = magnetic field intensity

θ = angle between the speed and magnetic field vectors

Also;

F_{C} = \frac{mv^2}{r}

Where;

m = mass of the particle

v = velocity/speed of the particle

r = radius of the circular path of motion.

From equation (i)

qvBsinθ = \frac{mv^2}{r}           [divide both sides by v]

qBsinθ = \frac{mv}{r}              [make v subject of the formula]

v = qrBsinθ / m            --------------------(ii)

From the question;

B = 1.0T

r = 0.4m

θ = 90°     [since magnetic field is always perpendicular to velocity]

q = 1.6 x 10⁻¹⁹C        [charge of a proton]

m = 1.6 x 10⁻²⁷kg        [mass of a proton]

Substitute these values into equation(ii) as follows;

v = (1.6 x 10⁻¹⁹ x 0.4 x 1.0 x sin90°) /  (1.6 x 10⁻²⁷)

v = 4 x 10⁷ m/s

Therefore the speed of the proton is 4 x 10⁷m/s

8 0
2 years ago
What is the magnitude of a the vertical electric field that will balance the weight of a plastic sphere of mass 2. 1 g that has
sladkih [1.3K]

The magnitude of a vertical electric field that will balance the weight of a plastic sphere of mass 2. 1 g that has been charged to -3. 0 NC is 6.86 × 10^{6} N/C.

An electric field is the physical field that surrounds electrically charged particles and exerts a force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field of a system of charged particles.

It is given that,

Mass of sphere, m = 2.1 g =0.0021kg

Charge,q = ₋3nC = ₋ 3 ₓ 10^{-9}

To balance the weight of a plastic sphere, we must determine the magnitude of the electric field. So,

ma= qE

a = g

E = \frac{mg}{q}

E = \frac{0.0021 * 9.8}{-3 * 10^{-9} }

E = 6860000 N/C

E = 6.86 × 10^{6} N/C

Hence, the magnitude of the electric field that balances its weight is 6.86 × 10^{6} N/C .

To know more about  electric field refer to:  brainly.com/question/8971780

#SPJ4

5 0
1 year ago
If a 500-pound object is moved 200 feet how much work is being done?
Paha777 [63]

Answer:

D

Explanation:

Work = Distance x Mass

4 0
2 years ago
Which action will decrease the gravitational force between two objects?
WITCHER [35]

Answer:

It’s D

Explanation:

6 0
3 years ago
A reversible reaction is in
natita [175]

Answer:

Equilibrium

Explanation:

  • Equilibrium is a special situation or stage of a reaction
  • At equilibrium the concentrations of reactants and products are equal
  • The rate of change of forward and backward reaction is also same
6 0
2 years ago
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