<span>B.the amount of space that matter ocupies</span>
Answer:
When the radius is doubled, its speed will be 42.42 km/h.
Explanation:
Given that,
The maximum speed around a level curve is 30 km/h = 8.34 m/s
We need to find the maximum speed around a curve with twice the radius. The maximum speed of the object is given by :
............(1)
If radius is doubled, r' = 2r
The maximum speed is given by :
..........(2)
Dividing equation (1) and (2) we get :
v' = 42.42 km/h
So, when the radius is doubled, its speed will be 42.42 km/h. Hence, this is the required solution.
Given:
Quantity of heat absorbed (Q)=54 calories= 226 J
m=58.3g=0.0583Kg
Tinitial:12°c=285.15 K
Tfinal:42°C=315.15K
Now we know that
Q= mc∆T
Where Q is the heat absorbed measured in J
m is the mass of the substance measured in Kg
c is the specific heat measured in
J/Kg.K
∆T is the change in temperature measured in K
Substituting the given values in the above formula we get
226=0.0583 x c x(315.15-285.15)
c=129.22 J/Kg.K
Thus the specific heat of lead is
129.22 J/Kg.K .
The height to which the weight-watcher must climb to work off the equivalent 991 (food) Calories is 0.59 Km
<h3>How to determine the energy. </h3>
1 food calorie = 103 calories
Therefore,
991 food calories = 991 × 103
991 food calories = 102073 calories
Multiply by 4.2 to express in joule (J)
991 food calories = 102073 × 4.2
991 food calories = 428706.6 J
<h3>How to determine the height </h3>
- Energy (E) = 428706.6 J
- Mass (m) = 73.9 kg
- Acceleration due to gravity (g) = 9.8 m/s²
E = mgh
Divide both side by mg
h = E / mg
h = 428706.6 / (73.9 × 9.8)
h = 591.95 m
Divide by 1000 to express in km
h = 591.95 / 1000
h = 0.59 Km
Learn more about energy:
brainly.com/question/10703928