1) How much work is done in pushing a crate with a force of 50N over 10m? a) W = mg b) W = Fs c) W = F/d d) P = W/t e) F = ke 2) How much kinetic energy does an object with a mass of 20kg have when it travels at a speed of 32m/s? a) Ek = ½mv2 b) Ek = mv2 c) Ek = ½mv d) F = ke e) Ee = ½ke2 3) How much work does a 65kg climber do against gravity when she climbs 20m? a) Ek = ½mv2 b) Ep = mgh c) Ep = mg/h d) W = mg e) W = F/d 4) How much energy is stored in a spring (spring constant = 12N/m) when it is compressed by 3cm? a) Ek = ½mv2 b) Ep = mgh c) F = ke d) Ee = ½ke2 e) F = dk 5) How much energy is needed to heat 1.2kg of water from 23º to 65º? a) T = 1/f b) E = mgh c) E = mL d) E = mc2 e) E = mc∆T 6) How much power is transferred to a kettle in 100s if it is constantly supplied with 50J of thermal energy? a) P = Et b) P = E/t c) E = P/t d) efficiency = useful power out / total power in e) Ep = mc∆T 7) What is the efficiency of a motor that transfers 20J of electrical energy to 15J of kinetic energy? a) efficiency = useful power out / total power in b) efficiency = total power in / useful power out c) efficiency = total energy in / total energy out d) efficiency = useful energy out / total energy in e) efficiency = total energy in / useful energy out 8) Calculate the specific heat capacity of concrete. a) E = mc2 b) W = Fs c) c = ƒƛ d) E = mc∆T e) c = mE∆T 9) What is the radiation power transferred by a 55⁒ efficient lightbulb with a power rating of 20W? a) efficiency = useful power out / total power in b) efficiency = total power in / total power out c) P = Et d) P = E/t e) energy = useful energy out / total energy in 10) A 20kg weight has a gravitational potential energy of 500J at the moment is dropped from a height. What speed will it be travelling at just before it hits the ground (assume air resistance is negligible)? a) Ep = mgh b) W = Fd c) W = mg d) s = d/t e) Ek = ½mv2 11) A 60kg student exerts 1500J of chemical energy climbing the stairs at school. What is the height of the stairs? a) W = mg b) W = Fd c) Ep = mgh d) Ek = ½mv2 e) P = E/t 12) A bungee cord with a spring constant of 42N/m stores 50 000J of elastic potential energy when a man of mass 75kg is at the bottom of his jump. What is the extension of the bungee cord at this moment? a) F = ½ke b) Ek = ½mv2 c) Ee = ½ke2 d) W = mg e) W = Fd 13) How much energy is transferred to a 40W lamp that is switched on for 2 hours? a) P = Et b) E = Pt c) s = d/t d) P = I2R e) Q = It 14) A 0.5kg ball is thrown vertically upwards with an initial speed of 4m/s. What height does it reach? (assume air resistnace is negligible) a) W = mg then Ep = mgh b) Ep = mgh then W = Fs c) Ee = ½ke2 then Ep = mgh d) Ep = mgh then Ek = ½mv2 e) Ek = ½mv2 then Ep = mgh 15) How much power does a 40kg child exert when she runs up a 2.5m flight of stairs in 11s? a) Ep = mgh then P = E/t b) Ep = mgh then P = Et c) Ek = ½mv2 then P = E/t d) E = Pt then P = E/t e) Ep = mgh then Ek = ½mv2
Energy Equation Selector
Paylaş
Paylaş
Jsteer
tarafından
KS4
Science
Energy
Beğen
İçeriği Düzenle
Katıştır
Daha fazla
Giriş gereklidir
Tema
Giriş gereklidir
Seçenekler
Afiş
Daha fazla göster
Daha az göster
Bu lider panosu şu anda özeldir. Genele açmak için
Paylaş
'a tıklayın.
Bu lider panosu kaynak sahibi tarafından devre dışı bırakıldı.
Seçenekleriniz kaynak sahibinden farklı olduğu için bu lider panosu devre dışı bırakılır.
Seçenekleri Geri Çevir
Şablonu değiştir
Etkileşimliler
Tümünü göster
Siz etkinliği oynarken daha fazla format görüntülenir.
Otomatik olarak kaydedilen geri yüklensin mi:
?