Answer:
F = 64.0 N
the magnitude of the force is 64 N
Explanation:
Given;
Mass m = 45kg
time t = 7.5 s
Displacement d = 40 m
Force = mass × acceleration
F = ma ........1
From equation of motion;
d = vt + 0.5at^2
Since initial velocity v = 0 (initially at rest)
d = 0.5at^2
Making a the subject of formula;
a = d/(0.5t^2)
Substituting the given values;
a = 40/(0.5×7.5^2)
a = 1.42 m/s^2
From equation 1;
F = ma
Substituting the given values;
Force F = 45 kg × 1.42 m/s^2
F = 64.0 N
the magnitude of the force is 64 N
Answer:
Examples of physical properties are: color, smell, freezing point, boiling point, melting point, infra-red spectrum, attraction (paramagnetic) or repulsion (diamagnetic) to magnets, opacity, viscosity and density. (HOPED THIS HELPED ;)
Explanation:
Given that,
Resistance of wire
R = 6.00 Ω
Cross sectional area
A = 300cm² = 0.03m²
Initial magnetic field Bi = 0.2T
Final magnetic field Bf = 3.6T
Time taken t = 0.5s
Current?
From ohms law
V=iR
Then, I = V/R
Therefore, we need to find the induced EMF in the coil
ε = -dΦ/dt
Where Φ =BA
Where the Area is constant
ε = -dΦ/dt = -d(BA)/dt
Since A is constant
ε = -A•dB/dt
ε = -A•(∆B)/∆t
ε = -0.03(3.6—0.2)/0.5
ε = -0.204 V
Then, the magnitude of the EMF is 0.204 V
So,
I = V/R
I = 0.204/6
I = 0.034 Amps
I = 34 mA
Option B is correct.
The correct answer of terrestial weather:
The solar insolation in the visible and infrared regions of the solar electromagnetic spectrum is much more than the energy that space weather occurrences release into the troposphere and stratosphere. Despite claims to the contrary, there may be some connection between the Earth's climate and the 11-year sunspot cycle. There is no proof of this. For instance, it has frequently been suggested that the Maunder minimum, a 70-year period almost devoid of sunspots, is correlated to a cooler climate, but these correlations have vanished after further research. Changes in cosmic ray flux are hypothesized to affect how much cloud formation occurs.
To learn more about weather refer the link:
brainly.com/question/9662539
#SPJ9
Thus, dark matter constitutes 85% of total mass, while dark energy plus dark matter constitute 95% of total mass–energy content. Because dark matter has not yet been observed directly, if it exists, it must barely interact with ordinary baryonic matter and radiation, except through gravity.