Answer: a) t = 1.8 x 10^2 seconds; b) t = 54 seconds; c) t = 49 seconds. Explanation: a) To determine the time of a stationary passenger on the sidewalk, we use the position formula. Given the constant speed of the walkway, we can calculate the time taken for set distances accordingly. This calculation extends into cases where combined velocities for walking are involved in subsequent queries.
0.04m²
Explanation:
Known values:
Pressure = 250000Pa
Weight = 40000N
Unknown:
Area of each foot =?
Solution:
Pressure is defined as the force applied per unit area of an object
Pressure = 
To determine the area;
Area = 
Area = 
= 0.16m²
The force exerted by all four feet amounts to 0.16m²
thus, the area for each foot is 
= 0.04m²
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Pressure
The response is affirmative .
An organism exhibiting the dominant phenotype can have two potential genetic combinations (for a gene with two alleles):
It might be homozygous dominant (WW) or
it can be heterozygous dominant (Ww), which is also known as a carrier
For instance, two black sheep can produce offspring with white wool if both are heterozygous dominant. In this scenario, both parents could pass on the recessive allele, resulting in their offspring inheriting the phenotype of white wool characterized by the genotype ww.
Answer:
The separation between Earth and the star is growing.
Explanation:
When we witness the electromagnetic radiation of an object shifting towards the blue spectrum, it indicates that the object is moving closer, which compresses the light waves and decreases the wavelength towards blue, referred to as blueshift.
Conversely, when an object retreats from us rapidly, its light waves are stretched, resulting in a longer wavelength that shifts towards the red part of the spectrum. This shift is termed redshift.
The alteration of wavelength and frequency due to relative motion (approaching or receding) is explained by the Doppler effect.
In this case, since the light we detect from the star has transitioned to the red part of the spectrum, we can infer that it is moving away from Earth, indicating that the distance between the star and Earth is increasing.
Answer:
Power output, P = 924.15 watts
Explanation:
We have the following parameters:
Length of the ramp, l = 12 m
Weight of the individual, m = 55.8 kg
Incline angle with respect to the horizontal, 
Elapsed time, t = 3 s
Let h represent the vertical height of the hill:
h = 5.07 m
Power P required for a person to ascend the hill can be expressed as:
P = 924.15 watts
This indicates that a minimum average power output of 924.15 watts is essential for an individual to ascend this elevation. Thus, this is the answer sought.
