A cross-country skier can complete a 7.5 km race in 45 min. What is the skier’s average speed?

On a day when the water is flowing relatively gently, water in the Niagara River is moving horizontally at 4.5 m/sm/s before sho

Maru [3345]

Answer:

a.3.29 m/s

b.3.3 m/s

c.14.8 m

d.15 m

Explanation:

We have the following specifics:

Initial Horizontal speed= $v_x=4.5 m/s$

Vertical component of initial speed= $v_y=0$

Vertical distance= $y=-53 m$

a. $s=ut+\frac{1}{2}gt^2$

Applying the formula and considering g as negative results in $g=-9.8m/s^2$

$-53=0-\frac{1}{2}(9.8)t^2$

$53=4.9t^2$

$t^2=\frac{53}{4.9} s$

$t=\sqrt{\frac{53}{4.9}}=3.29m/s$

b.Since the hundredths place exceeds 5, 1 is added to the tenths place, while other digits to the left remain unchanged and the digit to the right is replaced by 0.

$t=3.3 m/s$

c.Horizontal acceleration= $a_x=0$

$x=v_xt=4.5\times 3.29=14.8 m$

d.The digit in the tenths place at 8 surpasses 5, thus adding 1 to the units place, with all other digits on the left side unchanged and the right-side digit altered to 0.

Horizontal distance=15 m

7 0

3 months ago

On a hot summer day, you decide to make some iced tea. First, you brew 1.50 LL of hot tea and leave it to steep until it has rea

Yuliya22 [3333]

Explanation:

Please refer to the attachment for the solution.